01-25-2015, 02:24 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,005
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Not Ranked
With the key on, and the brake pressed, put one lead of your VOM on the middle RED input wire and the other lead on one of the two output wires. The reading will be the voltage drop attributable to the trailer relay.
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