Rear turn signals acting up - JeepForum.com
 
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post #1 of 8 Old 01-19-2020, 11:14 AM Thread Starter
georgedunham
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Rear turn signals acting up

I took the 85 Cj out yesterday and noticed that the turn signal indicator on the speedo was behaving oddly. In my experience, that often means that something is out of order, i.e. a bulb burned out. When I got out and inspected the signals, the front functions fine but both sides in the rear flash when either side is activated.
Anyone seen this before?

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post #2 of 8 Old 01-20-2020, 06:12 AM
mjp83
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So if both blinkers in the rear flash at the same time, by either turning the left or the right signal on, then I would suspect a bad turn signal switch (broken part inside under steering wheel), or maybe the relay went? Or the wire that runs to the rear, coming from fuse box rubbed clean and is crossing over the signals.
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post #3 of 8 Old 01-20-2020, 01:40 PM
Cutlass327
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Do the sides usually flash with the turn signals? Mine has an aftermarket harness so they don't.

If they are not supposed to, you either have a bad ground or wire shorted across.

Rick

1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy


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post #4 of 8 Old 01-20-2020, 01:51 PM
cJAY904
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i would start simple, go to local parts store and replace the flasher. They are cheep and easy.
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post #5 of 8 Old 01-20-2020, 08:31 PM
Cutlass327
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Quote:
Originally Posted by cJAY904 View Post
i would start simple, go to local parts store and replace the flasher. They are cheep and easy.

It flashes, so flasher works.

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Another thing to check, pull the bulbs in the taillights one at a time. Pull left, try it, if it still does it, put left back in and pull the right. It is possible the terminals or even the filament of the bulb has turned and is shorting across and powering the markers with the turn.



The side marker bulbs take less power to light up, so there may not be a "dead short" or complete loss of ground to cause the rest of the lights to show up. This may make it harder to diagnose.

Rick

1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy


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post #6 of 8 Old 01-22-2020, 09:35 AM Thread Starter
georgedunham
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The front side markers do flash, the rear appear to, but that's not the side marker bulb flashing, just the design of the fixture. I did try removing the bulbs. That's not it.
So I started disconnecting connectors and testing continuity. I think that it is the multi function switch. I discovered continuity between rear left and right, but not between front left and right.
I will remove it and hopefully repair it. I don't want to buy that part again, it's only 3 years old.
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post #7 of 8 Old 01-28-2020, 09:08 AM Thread Starter
georgedunham
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The problem seems to be solved. It got even weirder. The front right indicator would go on when the foot brake was applied.
Anyway, I put a new AC Delco multi function switch in. That appears to have fixed it. The faulty one I just removed was the standard motor products tw20t. It was fewer than 5 years old with less than 5000 miles on it. Also, the new unit had continuity between left and right, the same as the faulty unit, so I clearly don't know how to test them or if they even can be tested.
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post #8 of 8 Old 01-28-2020, 11:41 AM
John Strenk
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Sometimes just tightening up a screw can fix a problem and then you never know what you did.

Maybe the problem slipped out for a beer but will be back in a little while.


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