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Old 12-28-2017, 04:01 PM   #1
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dull tailights/dash lights (help)

I have a 1994 Dynasty (bought new) that the taillights, and dash lights are very dim. I was wondering if it is a ground problem. This started slowly, but it now very noticeable. Any suggestions would be appreciated. Larry
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Old 12-28-2017, 04:05 PM   #2
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Your assumption regarding the ground circuit is correct.
Most 12 volt problems are caused by a bad ground. The ground wire is where I always start when I have issues such as you explained.
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Old 12-28-2017, 07:37 PM   #3
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Should be easy enough to test. Run an additional ground from a clean spot on the frame to one of the taillights and see if it gets any brighter.
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Old 12-28-2017, 08:18 PM   #4
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If the temporary ground wire does the trick from there it is easy, clean frame ground wire on each light.
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Old 01-01-2018, 10:28 AM   #5
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Very simple to check ....and you don't have to guess.

Hook a volt meter to your battery ground post and measure your open circuit voltage at the battery for reference, it should be @ 12.5-12.6. So now you know what voltage is available to your lighting.

( the video shows 12.0 VDC as a reference only and as stated your open circuit voltage will be @ 12.6 with a fully charged battery)


Take your voltmeter positive lead and measure voltage as explained in this video.

With your problem lighting circuit turned ON ...backprobe and read your positive + voltage going in, it should and be very close to your battery reference voltage a max of .5 or less of your battery reference voltage.

Now take your same positive voltmeter probe ( and with the lighting circuit turned on ) backprobe and measure the voltage at your ground side ....the voltage should read less than .5 VDC. If you read anything higher than .5 VDC on the ground side you have resistance problem on the ground side of your circuit and you need to find it and repair it ....or as described run an alternative ground wire to the problem circuit and IMO if you have a ground problem your best bet is to run an alternate ground wire and be done with it.



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