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sc91gt
10-25-2010, 09:15 PM
Hello, I've tried the seach in this forum, but it will only search turn, and signal separately. Which only comes up with a billion threads to no where. So, can anybody tell me why the turn signal will work fine sometimes, sometimes not at all, sometimes sporadicaly. Any ideas would be great. Thanks,Shawn.

EatonEmployee
10-25-2010, 09:27 PM
Your SC has fog lights right? Does it have auto dim? It is the multifunction switch. It is that whole assy with your wipers, low/high beam, hazards and turn signals. It was a TSB or recall on most our cars. Make sure the pigtail isn't melted when you change it. If it is put a new one on. Buy Wells, duralast or OEM. If you buy from AM or partstrain you will get bad ones. I know I put two bad brand new ones in before I bought a decent one.

frdlvr30
10-25-2010, 09:34 PM
Your SC has fog lights right? Does it have auto dim? It is the multifunction switch. It is that whole assy with your wipers, low/high beam, hazards and turn signals. It was a TSB or recall on most our cars. Make sure the pigtail isn't melted when you change it. If it is put a new one on. Buy Wells, duralast or OEM. If you buy from AM or partstrain you will get bad ones. I know I put two bad brand new ones in before I bought a decent one.

And also check the ignition switch on the column. They come apart and can cause intermittent turn signal malfunction....12.00 part...

sc91gt
10-25-2010, 09:51 PM
Standard headlight switch, new and good, newer good headlight harness, foglights are not working. But have not tried them since headlight/dashlight fix. Put in a used junkyard multifunction switch that actually clicks when you hit it. I know, its a used part too... The harness' looked good when I switched it. ? Thanks
Your SC has fog lights right? Does it have auto dim? It is the multifunction switch. It is that whole assy with your wipers, low/high beam, hazards and turn signals. It was a TSB or recall on most our cars. Make sure the pigtail isn't melted when you change it. If it is put a new one on. Buy Wells, duralast or OEM. If you buy from AM or partstrain you will get bad ones. I know I put two bad brand new ones in before I bought a decent one.

sc91gt
10-25-2010, 09:53 PM
I will try that first since it's cheap and easy. thanks.
And also check the ignition switch on the column. They come apart and can cause intermittent turn signal malfunction....12.00 part...

EatonEmployee
10-25-2010, 10:49 PM
hold up, you swapped all three at once. I always swap 1 part at a time so if I have a problem I can troubleshoot it. Now you have no foglights and you could have three culprits. Most likely your standard headlight switch was not for a car with foglights. Correct me if I'm wrong folks.

sc91gt
10-28-2010, 08:56 AM
I first changed the burnt headlight harness and turnsignal stalk. Then I tried a different headlight switch. Since the new headlight switch didn't cure the dashlights I put the motorcraft one back in, and the one i bought in the glovebox. The dashlight culprit was the po's hack job on the stereo wiring. So now the lights work great but the turnsignal is still intermittant. It seems to happen mostly with the headlights on. ? As for the fog lights they did not work when I bought the car and still don't. I have not messed with them yet. Was hoping headlight switch would get them working. Going to check for voltage, but not a high priority yet. Does this help? Thanks for the imput.
hold up, you swapped all three at once. I always swap 1 part at a time so if I have a problem I can troubleshoot it. Now you have no foglights and you could have three culprits. Most likely your standard headlight switch was not for a car with foglights. Correct me if I'm wrong folks.

the-big-e
10-28-2010, 09:34 AM
How did you fix the PO's hack job on the wiring harness.....

Are you sure you installed the correct MFS.....

There are 3 different MFS...

DrFishbone
10-28-2010, 12:51 PM
I'd definately check the ignition switch. They ALL will wear out after awhile. Don't put it off either. If you have an 89-91?, you could lose your brakes!! :eek:

I lost turn signals the other on my car...everything else worked fine (I have a conventional brake swap). Turnsignals worked the next day....the following day, the car wouldn't start. :rolleyes: I'm sure the ignition switch is the problem...it was looking a little loose when I had the dash apart, but I was trying to get my car finished for the shootout. :rolleyes:

On another SC, I lost turnsignals and brakes at the same time...on an exit ramp!!! Changing the ignition switch fixed it.

Ed - what are the three different MFS's? I only knew of two. :confused::eek:

sc91gt
10-29-2010, 06:51 PM
Wiring harness for headlights, I cut the burnt one out and spliced in a good one. For the stereo I found a couple of wires under the plastic touching metal with no insulation or spotty tape job. Deck looks to have been cut out. So I covered all open wires and bundled them nicely till I get a deck. As for the MFS? It looked the same as mine and had all the same pins in the same locations. And the turn signals do the same intermitant no work thing. This morning driving home with the lights on The signals worked fine. Yesterday eve only once in awhile. I have a new ignition switch, just need to get torx bit.
How did you fix the PO's hack job on the wiring harness.....

Are you sure you installed the correct MFS.....

There are 3 different MFS...

sc91gt
11-02-2010, 06:39 PM
Well, I put a new BWD ignition switch in and the signals wouldn't work at all? Also It died and would turn over fast, faster than normal but would die as soon as you let off the key. Put the ford switch back in and fired up worked fine. Anyone had issues with oreilly's BWD brand stuff before? That is the third suspect Item I've got for this car, headlight switch,dis module, and ignition switch. In all situations I put the ford part back in.

sts70004
11-02-2010, 06:53 PM
I don't know if you checked this in regards to your turn signals, but my relay had a bad solder joint that just went out, and all I did was resolder it and they started working again. My turn signals would do the same thing yours were doing.

the-big-e
11-02-2010, 07:46 PM
Ed - what are the three different MFS's? I only knew of two. :confused::eek:

There are white letters on the bottom of the MFS that end with AAD, BAD, and CAD.....

AFAIK, they are not interchangeable....:rolleyes:

sc91gt
11-04-2010, 09:25 PM
Where is that relay located? Thanks, Shawn.
I don't know if you checked this in regards to your turn signals, but my relay had a bad solder joint that just went out, and all I did was resolder it and they started working again. My turn signals would do the same thing yours were doing.

sts70004
11-04-2010, 11:26 PM
Where is that relay located? Thanks, Shawn.

Its under the dash board, on the driver's side, toward center console. Its a large black relay. Biggest one in there, and its mounted on the flat part under the dash, not on the vertical part under the dash thats on the transmission tunnel.

sc91gt
11-07-2010, 10:06 PM
Well, when I installed the previous ignition switch it must not have been in the ''run'' position like it was supposed to. When I connected the battery cable all the instrument lights came on as well as the abs solenoid and the the chime for when you leave keys in ignition/lights but instead of dinging it was constant. The ignition cylinder was almost stuck. Worked the cylinder till it slotted the pin in the switch and the car would turn over, but faster than normal but no start. So I disconnected the bat took out the new switch, made sure the ford switch was in the right position and re-installed it. Now it starts up and runs fine but no sigals or reverse lights. Fuses are good. Pushed the hazards and all four corners light and blink like they are supposed to. Have no idea what i could have screwed up.? Any ideas? Please.:(

sts70004
11-07-2010, 11:08 PM
Well I don't know about the reverse lights but my hazards worked fine before I resoldered the relay pin, but my signals didn't.

sdw
11-08-2010, 12:19 AM
Given the poor wiring set-up for the lights i'm of the opinion putting in a set of auxiliary relays to run the headlights and fog lamps should be a must do on every ones list.

Your lights will be brighter and you won't ever have to replace your MFS and headlight switch again.

Sean

sc91gt
11-08-2010, 06:17 PM
Since my previous ignition switch snafu my signals went from working most of the time to not at all and reverse lights no longer work. I tried again swapping switches and turn signal/mfs today. Nothing. Also rechecked all fuses since manual says signal flasher and reverse lights are on the same one and they are all good. The signal relay under the dash clicks and fires the signals at all four corners when hazards are on, but does nothing when I hit the turn signal individually. Does anybody know what can cause this? It sucks to not be able to drive my car for something so simple. Thanks for all the previous info. I am going to go check the fuse slot for voltage. Fuse slot for the flasher/reverse lights has 11.72 volts with ignition on. ?

sc91gt
11-08-2010, 06:36 PM
By luck I think my Junkyard mfs switch has the same letters.
There are white letters on the bottom of the MFS that end with AAD, BAD, and CAD.....

AFAIK, they are not interchangeable....:rolleyes:

shoalcracker
11-08-2010, 06:54 PM
Not to be bad.

Burns to the extreme end. (headlights, Stereo component issues).

If you have Electrical TSG trace all wires off column to end.

Hackers steal/combine power from anything not realizing.

There's a significant ground in the left kick panel. Make sure its in play.

I don't have anything to reference at this time so from there....

Paul

sts70004
11-08-2010, 10:02 PM
Since my previous ignition switch snafu my signals went from working most of the time to not at all and reverse lights no longer work. I tried again swapping switches and turn signal/mfs today. Nothing. Also rechecked all fuses since manual says signal flasher and reverse lights are on the same one and they are all good. The signal relay under the dash clicks and fires the signals at all four corners when hazards are on, but does nothing when I hit the turn signal individually. Does anybody know what can cause this? It sucks to not be able to drive my car for something so simple. Thanks for all the previous info. I am going to go check the fuse slot for voltage. Fuse slot for the flasher/reverse lights has 11.72 volts with ignition on. ?

Thats what happened when my relay was bad. Hazards worked fine, turn signal relay clicked, but when you hit the turn signals individually, nothing. Take a look at it. Open the case and inspect with a magnifying glass all the solder joints. A bad one will have a little crack around the joint. How I figured it out was I had my relay case off but it plugged in and a squeezed down on the components and it started to work.

sc91gt
11-10-2010, 01:01 PM
Pulled the relay apart and apon visual inspection it looks fine. Can't see anything burnt or amiss. Thinking I might just buy a new one to rule that out. Hate just throw money at, but when the ignition switch did the funky chicken maybe it fried the signal part of relay. ? I took the lower dash apart to see If I could find some obvious stuff. Can't be sure but most the wires going into the fuse panel look good. Looks as if the PO might have had his mits under the dash. Some of the harness aren't locked into their plastic clips and there looks to be an non-original cable tie between two harnesses. Also found this I think 12ga wire cut under the plastic in between the door/dash. Couldn't see where it was attached to previously. So if anyone know what it goes to that would be a big help. I will have take the whole dash out. :(
Thats what happened when my relay was bad. Hazards worked fine, turn signal relay clicked, but when you hit the turn signals individually, nothing. Take a look at it. Open the case and inspect with a magnifying glass all the solder joints. A bad one will have a little crack around the joint. How I figured it out was I had my relay case off but it plugged in and a squeezed down on the components and it started to work.

sc91gt
11-12-2010, 05:31 PM
Installed a new relay and signals work perfect and the reverse lights too. Now it's at the shop getting dual 2.5 mandrel bent pipes put on, with magnaflow resonator and mufflers.:D But I get the signals working and now the ride control doesn't:mad: It's a good thing I like tinkering(most the time anyways). Get one thing fixed and two quit workining.
Thats what happened when my relay was bad. Hazards worked fine, turn signal relay clicked, but when you hit the turn signals individually, nothing. Take a look at it. Open the case and inspect with a magnifying glass all the solder joints. A bad one will have a little crack around the joint. How I figured it out was I had my relay case off but it plugged in and a squeezed down on the components and it started to work.

Regul8r
10-20-2012, 04:21 PM
Same issue, same final thoughts...
NEW MFS and still same issue.
Checked all connections, fuses wires etc...

Relay works fine for Flashers but clicks almost buzzes like a bad connection in the box when you hit the turn signals.

Now I have been on the phone with O'Reilly's and Auto Zone... They say they do not see it or cannot get it/not available!

This one has an E80B part number saying it was used on 1988 vehihicles and carried over through my 1990 car.

I cannot find it on Rock Auto either!
ANYONE have a Manufacturer and PART # for this.


Took it apart, nothing obviously burnt or damaged.

All the threads I found in the search were old and said nothing available aftermarket, has that changed in the last couple years?

RalphP
10-20-2012, 07:51 PM
Nothing I can find, Regul8r.

That's why I converted to use the EP27. Well, that and the LED tail lights.

However, in the member's section there's instructions on how to put a newer turn signal into the older housing.

RwP

Regul8r
10-20-2012, 08:34 PM
Nothing I can find, Regul8r.

That's why I converted to use the EP27. Well, that and the LED tail lights.

However, in the member's section there's instructions on how to put a newer turn signal into the older housing.

RwP

thanks, thats what i found too.

sts70004
10-20-2012, 09:10 PM
Same issue, same final thoughts...
NEW MFS and still same issue.
Checked all connections, fuses wires etc...

Relay works fine for Flashers but clicks almost buzzes like a bad connection in the box when you hit the turn signals.

Now I have been on the phone with O'Reilly's and Auto Zone... They say they do not see it or cannot get it/not available!

This one has an E80B part number saying it was used on 1988 vehihicles and carried over through my 1990 car.

I cannot find it on Rock Auto either!
ANYONE have a Manufacturer and PART # for this.


Took it apart, nothing obviously burnt or damaged.

All the threads I found in the search were old and said nothing available aftermarket, has that changed in the last couple years?

Buzzing is an intermittent electrical connection in the relay. Might be worth resoldering all the pins just in case. Its a free fix if it works. Ford could get me a replacement relay... for $60! Its some japanese relay.

Regul8r
10-23-2012, 01:10 AM
Ran by the local JY today and pulled the relay from an 89.
Found a single loop 3/8" tubed P/S cooler about 12" long too.

Both for the $7 I had in my pocket.