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

T Mo · Posted at Thu Mar 27, 2008 7:50 am

Electrical problem
1985 Other GMC Models V8 Four Wheel Drive Automatic 80,200 miles
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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?

rasmataz · Posted at Thu Mar 27, 2008 8:00 am

What are you working on? I don't get it

T Mo · Posted at Thu Mar 27, 2008 8:55 am

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.

rasmataz · Posted at Thu Mar 27, 2008 12:50 pm

For me at the coil side of the relay positive goes in and the other side goes to ground