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Old 07-05-2015, 12:29 AM
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YNOBIL YNOBIL is offline
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Join Date: Jan 2006
Location: Countryside, IL
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Looking at the 1972 Pontiac Shop Manual Wiring Diagram I see that the heater control lamp should be fed by a grey wire. This grey wire is linked to the radio indicator lamp.
If your radio light is OK I think you need to look at the ground for your heater lamp.
Also I wish I could go to my salvage yard and find a 1972 to pull parts off of.

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