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Old 03-01-2018, 07:47 PM   #1
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Turn signal not working with headlights on?

I'm having a very strange electrical problem in my 2001 ZX3.

I pulled off my front bumper cover which is now reinstalled. Since then, with the headlights off my turn signals all work, but right turn signal indicator blinks twice as fast. When I turn the headlights on, the right turn signal indicator stays solid all the time, even with the turn signal off and the right running light (in the grill) does not work, right side marker does not work and they do not blink with the turn signal on. I do not have LED headlights and I checked the resistance of the ground at the running light to the chassis and it's 0.00. I double checked all plugs and unplugged and replugged them back in. Anyone have any advice?
Could this be related to the umbilical? My turn signals stopped working completely and I soldered new wire into the umbilical and now they are working 99% of the time, but still have an occasional problem.

Thanks in advance.



Last edited by sfcarlock; 03-01-2018 at 07:52 PM.
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Old 03-02-2018, 12:17 AM   #2
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I don't understand what caused this problem, but after probing wires all night, I realized that there was voltage going to the ground wire leading to the running light. This was not true for the side marker and turn signal on the tail light. It may be unrelated to removing the bumper cover, but statistically, I doubt it. I severed the ground wire to the running light and added a new ground. It's all good now!

Here is another post I made on Facebook in case another member wants to know my symptoms in the future.
"I am having the weirdest electrical problem with the Focus. Right turn signal indicator blinks fast but all lights work with the headlights off. With headlights on, indicator is solid and running lights and side markers don't work on that side and don't flash with turn signal on. Hazard lights work, all flash normally, but right side bulbs are dim in the front. All the sudden, beeping is coming from a speaker in the fuse block under the dash unless I pull the right turn signal fuse. Checked voltage of all wires at the turn signal and I am getting 7.55 volts on the ground wire, but normal voltage at the other wires. Resistance from the power wire to the ground shows infinite. The flashers are in the hazard switch, which I switched with a spare and that doesn't fix the problem. I have a spare turn signal switch and that doesn't fix the problem. I switched all bulbs from left/right side and it's still on the right side, so it's not a bulb problem. There is not corrosion on any of the plugs. The wires going through the umbilical to the hatch are 99% good. I'm usually good with electrical, but I am at a complete loss ��"

Last edited by sfcarlock; 03-02-2018 at 12:36 AM.
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Old 03-02-2018, 12:37 AM   #3
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Hmmmm...???

Sorry you had no Reply from FF.

My brain is too tired, and I am too busy to give you a good reply. Maybe tomorrow I will look at this again to get a better understanding of what caused your initial problem & your fix. Or not, and it was a bad ground?

Either way, your got it fixed, right? -Great job man!

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Old 07-21-2019, 04:00 PM   #4
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Troubleshooting signal problem

Hmm. I'm having almost this exact same problem, with a 2002 Focus wagon, except that we don't have any bumper covers or any other modifications up there. We checked the fuses and they're good it sounds like I have to find a voltmeter and see if there's voltage in the ground leading to the right running light?
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Old 07-22-2019, 12:22 AM   #5
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I did not read the OP posts, but, when I hear Wagon AND tail light problems the first answer is always; Check the health of the wiring inside the rubber boot umbilical between the car body and the rear hatch door (lift-gate).

The wiring inside this spot is almost always damaged (mine was).
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Old 07-22-2019, 12:20 PM   #6
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Quote:
Originally Posted by Marde View Post
I did not read the OP posts, but, when I hear Wagon AND tail light problems the first answer is always; Check the health of the wiring inside the rubber boot umbilical between the car body and the rear hatch door (lift-gate).

The wiring inside this spot is almost always damaged (mine was).
Poster has wagon but did not mention tail lights. In fact he did not really explain his issue except that it was the 'exact same problem' as OP from 2018 that had a ZX3. I alway recommend that all post their specific vehicles issue in a NEW thread and provide as much info/background as possible - something not provided by this poster.

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Old 07-22-2019, 01:23 PM   #7
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The bumper cover is just the big plastic body-coloured piece, not an aftermarket modification.

It's easiest with a multimeter, definitely. Lots of decent YouTube videos out there to show you how to use one if you're unfamiliar. You don't need a high-end one, so get a Harbor Freight $10 special and you'll have all you need for basic electrical diagnosis.

Start with a visual check of each wire and connection. Unplug every bulb, clean its connectors, make sure the socket isn't caked with corrosion, check wires for breaks or fraying, clean up grounds.
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