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Old 08-03-2020, 11:49 AM   #2
VetteVet
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Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,459
Re: Tail light issues

This should be an easy fix but you need to tell us what year truck you have cause the circuits are different on the different years. You have to separate the key on and key off circuits because the tail lights and stop lights are on different circuits. The turn lights work with the stop lights but only with the key on.
. What happens when you turn the headlights on with the brakes on and with the key off and what happens when you turn the tail lights on with out the brakes on with the key off.
You might have a battery draw issue when the headlights are on too. It's just too hard to tell with so little details.
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