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Wiring a 2008 Saab 9 3 Combi Wagon for Trailer Lights


What would be the best way to hook up trailer lights to a 2008 9 3 Saab Combi Wagon?


Expert Reply:

You will need Upgraded Circuit Protected Modulite, # 119147KIT.

First, find a good spot to mount the circuit protected converter in an out of the way place near the left tail light in the trunk or on the frame rail, if mounted under the vehicle. Next, find a place to ground the converter such as an existing ground stud or drill a 3/32 inch hole and secure the white wire using the eyelet and screw provided.

Disconnect the vehicles negative battery terminal. Using an in-line fuse holder, crimp a ring terminal to one end (3/8 inch for top terminal or 1/2 inch for side terminal). Attach the fuse holder (with fuse removed) to the positive battery terminal. Route 12 gauge or larger wire from the fuse holder to the converter, passing under or through the vehicle. Attach the 12 gauge wire to the fuse holder and converter with butt connectors. Reconnect the vehicles negative battery cable.

For a 3 wire system (with amber turn signals and separate bulbs for stop and turn signals) use a circuit tester to determine which wire attached to the left taillight assembly is the left turn wire.

Attach the units yellow left turn wire to this wire using wire taps. Determine which wire is the taillight circuit and attach the modules brown tail/license wire to it with a wire tap. Determine which wire is the stop circuit and attach the modules red stop wire to it with a wire tap.

Route the units green right/turn wire to the right side of the vehicle. Determine which wire
is the right turn circuit and attach the green wire to it with a wire tap. Install the 10-amp fuse into the fuse holder and test the installation with a circuit light or trailer.

I have included a link to more detailed instructions.

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