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Also, the expert in the Chevy thread I linked above seems to have a point, he says fan relays are also ground triggered.
His proposed solution is more than I want to do to achieve a light, though.
“ Also you can't just wire into the fan relay(s) for the same reason, they are switched on the ground side as well.
I would say that the easiest way out would be to wire in another relay to switch the fan on on the hot side. Easy to do just constant ground the relay coil at 85 and then switch the 86 side with the LED toggle. You'd have to jumper from the 30 terminal on the fan relay to 30 on the LED relay and jumper from the 87 on the fan relay to 87 on the LED relay. This would jump the fan relay and supply positive current to the fan through the LED relay.”
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