1985 Other GMC Models need to find out....

1985 GMC
80,200 MILES • V8 • 4WD • AUTOMATIC
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T MO
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I have a 1985 GMC Suburban and I need to find out if it is positive side switched or negative side switched, how do I know?
Mar 27, 2008 at 10:50 AM
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RASMATAZ
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What are you working on? I don't get it
Mar 27, 2008 at 11:00 AM
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T MO
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I am installing a headlight flasher and I need to know if I have a positive or negative side switched system, dont know how to find out.
Mar 27, 2008 at 11:55 AM
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RASMATAZ
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For me at the coil side of the relay positive goes in and the other side goes to ground
Mar 27, 2008 at 3:50 PM