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Thread: Brake light turn signal issue
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04-12-2021 #1Registered User
- Join Date
- Sep 2017
- Posts
- 26
Brake light turn signal issue
Hey guys. So I purchased a 1968 Firebird. It appears to have had an 18 circuit painless system installed. When I picked it up the rear of the car had everything in it but non of the lights worked. I ordered new sockets and replace them and ensured I had good grounding to the housing. So I got my brake lights to work and my turn signals to work... Kind of.... I hit my brakes and they all come in like they are supposed to... I hit my brakes and turn the left turn signal on and everything seems to work as it should... I hit the brakes turn the right turn signal in and my left brake light extinguishes and the right turn signal works as it should. What would he making my left brake light extinguish when I turn my right turn signal on?? Any help would be greatly appreciated. I don’t seem to have any power going to my running lights in the back either. Could that have something to do with it?
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04-12-2021 #2Registered User- Join Date
- Jan 2018
- Location
- Saint Louis, Missouri
- Posts
- 87
Do you have a test light and/or a voltmeter and know how to use them ?.
I would then start with taking out all of the rear bulbs and testing each socket to see what terminals have power with the parking lights on then which terminals would then have power with the parking lights off but the brake lights on, and then with the parking lights off and the brakes off with the left turn signal activated and then the right. I would then verify you have a good ground, not so much visually, but electrically using the test light and/or volt meter.
Keep in mind that some sockets may require an 1157 bulb that has the double filament and these sockets if not grounded well can backfeed electricity in an unwanted way. If for example the combination left turn signal/brake light bulb and parking light bulb did not have a good ground, then when the brakes are applied you could be sending power back to the brake light bulb but now also backfeeds power into the parking light circuit to where then the parking lights would also come on and not at full brightness as the connections are in a series setup and instead of bulbs receiving full 12v or so, each bulb then might only be getting 3 volts and during the daylight it might be hard to see this barely lit up bulb or you may be thinking a bulb is going off but instead has just a small amount of power going to it and you cannot see this light being lit up just a tad.
If you can take some pictures off all of the new sockets you added and what wires got connected from each.
If things do not test out properly in the back, you might have to then go to the turn signal connector on the column for some testing and "may" find out you have a turn signal switch issue.
Jim
04-12-2021 #3