Re: Trailer wiring, SAAB wiring harness - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Trailer wiring, SAAB wiring harness
Posted by Stephen Goldberger (more from Stephen Goldberger) on Tue, 29 Apr 2003 11:20:16
In Reply to: Trailer wiring, SAAB wiring harness, Aero'ed, Tue, 29 Apr 2003 10:36:28
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The wiring that comes with the Saab hitch includes an adapter box to convert to a 3 wire, two light system (combined tail/brake bulb, turn signal overrides the brake)with a flat 4-wirer connector. I don't know what you get when you order the wiring kit separately. The ground coming back from the trailer gets tied to the body. Think about the regular Saab system: you could have two tail lights, two brake lights, reversing lights, all coming back from the trailer ... that would be one mother big ground wire you'd need buried in the wiring loom. Then, there's the lights on the car and their returns, and for every circuit feeding out you need to add that much more capacity coming back, lest the wires catch fire without the fuse blowing. Hence, the tendency to just ground things to the body. Plus, it prevents ground loops.
posted by 65.25....
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