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Fred:

I created my own wiring harness (in retrospect, that probably added a month of fiddling around getting it wired, too!) but did pretty much the same as I've seen on a number of other cars;

My fuse/relay box is under the hood, right in front of the gauge cluster and slightly toward the outside (it is about 8" square and 2-1/2" thick and wouldn't easily fit under the dash). I routed all the wires to/from that block through a gasketed hole to under the dash area. (If you have a "standard" harness (like from CMC or VS) then the fuse block goes up under the dash above your left knee).

From there, three wiring trunks branch out:
A. One for the under dash/gauge cluster area, including the wiper motor above the passenger's right foot (Mine's not a VW wiper motor). This starts right behind the gauges and makes a "T" feeding both sides of the dash and includes two terminal blocks behind the dash for "Ignition" and "Alternate" 12V feeds from the key for various accessories.

B. One for everything out front; headlights, fog/driving lights, horns, stop light switch, fuel tank sender, windshield washer motor and two 14g spares. This starts behind the gauges and exits on the drivers side through the inner wheel well, then travels along the the left side of the bulkhead with feeds branching as they occur, and is held in place with cable ties and 10-32 screws with aircraft nuts. It feeds the drivers headlight first and then travels across the front of the battery well to the Passenger headlight. Those feeds not yet used are simply dressed off and tie-wrapped to whatever's handy for now. BTW: I ran 10 gauge wire to both headlights, and 12ga to the fog/driving lights. Overkill, to be sure, but it was lying around and got used.

C. One trunk for everything out back; ignition, Alternate 12V (back-up light and O2 sensor heater), dedicated stop light (for brakes and third brake light), left/right directionals, tail lights, O2 sensor lead, tach, oil pressure, (1) 14 g Spare (I used 1 spare already for the O2 sensor). This one starts behind the gauges, travels to the driver's side and down behind the kick panel, under the carpet to the floor and travels along the floor just inside of the sill and under the carpet (it follows between the sill and the outside of the seat runner) taking the traditional VW route. There should be a hole on the drivers side behind the seat for it to exit through the pan the the left rear wheel well area, right beside the brake line opening. From there, it follows along the drivers side frame member to the engine compartment where it "T's", one branch going to the third brake light/starter area which then continues with two leads to the alternator, coming up on the passenger side of the engine. A second branch services the ignition/tach/oil pressure area (my coil is mounted on the driver's side fender wall) and continues with another branching across the rear to the passenger tail light with feeds broken off along the way for lights and O2 sensor.

My battery is mounted at the front of the car, so I needed a 2 gauge battery cable to go from there back to the Starter, and an 8 ga as a main feed to the fuse/relay block. Those run through a hole behind the battery, then to the passenger side and up over the tie rod along the passenger side of the hood compartment bulkhead (held in place with cable ties(clamps), where it splits and the fuse feed goes in under the dash and over to the fuse/relay block. The battery cable continues from the "T" inboard and down to the passenger footwell bulkhead, through a gasketed hole and along the left side of the passenger floor (under the carpet right next to the tunnel) then through a gasketed hole at the back of the pan and over to the Starter.

I'm probably forgetting something, but that should pretty well cover it.

gn
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