Re: Rear Light Failure - Blown Fuse - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Rear Light Failure - Blown Fuse
Posted by Dean [Email] (more from Dean) on Mon, 5 Jun 2006 09:35:32
In Reply to: Rear Light Failure - Blown Fuse, BoZs13, Mon, 5 Jun 2006 06:00:34
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You can check ohms on a circuit to ground with a meter to avoid wasting fuses.
Start pulling out the trunk lining. There is a 10 pin connector in the trunk to the rear of the LH wheel well. I would start by disconnecting then probe for low to zero ohm circuits (in both directions). (1) Green-white goes to the licence plate lights. Water trapped in there?
Expose the rear lamps and remove RH harness connectors and see if low ohms goes away or stays. Check ohms of the lamp itself. Also do the same for the (2)front turn signal corner lamps [green/white], and same color wire going into the (3) main headlamp assy, and the (4)side markers. Look for damage to wires and corrosion of connetors.
Has any work been done that might be pinching a wire for the reostat or lamp outputs that go everywhere? You can pop the reostat out and remove from the connector. Power comes in on green/white-pin 7 and goes out on pins 2,3,5,9. Pin 1 is black-ground. With that unplugged, does the short circuit go away? If so, might be in the reostat or in the lines going to the various lamps that it drives. (This is a T5 thing, T7 has the reostat function going via the SID and ICE - very different)
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