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Re: 72 GMC Brake light Probems
I just installed this same kit on my GMC without any issues.
You might want to check the rear connector to make sure the rear connector is making contact properly. Also, start from the connector in the dash and measure the voltage to ground on the yellow wire with the brake pedal pushed, then check it back at the rear connector and then check it at the light bulb housing. Always measure it to ground. These male and female connectors can get folded over in the housings also if you are not careful.
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