I've got a number of problems with regard to hard wiring a Bel STI
the biggest being I know little to nothing about auto electrics.

Can anybody suggest where I can earth the unit that is close to the fuse box/sunroof on a 996TT?

TIA

Mark

 

http://www.geocities.com/porschecarr...3_document.htm

I followed this guide to hardwire my V1. Probably would help.

 

Pretty much every vehicle on the road today has a negative grounded frame. What that means is, they just hook the negative terminal of the battery to the frame of the car, and anywhere you attach any wire to the frame is a ground.

Really convenient for spark plugs, as they only need 1 wire, where the plug screws into the block is the ground. If you look at a lot of switches and such on most cars, they only have 1 wire going to them, the other is grounded straight the the frame or bracket they are mounted in to complete the circuit.

Basically all you need to do is find some spot near wherever your wiring that has a screw or bolt and use that as a ground, or drill a hole in a convenient piece of metal and make your own. Just make sure to scratch off the paint just under the head of the screw/bolt so the wire make good connections.

No need to get close to the fuse box, especially given the fuse box only deals with positive wires, not negative or ground wires. You'd actually want to try and get as close to the battery as possible, but in reality the closest most convenient spot to whatever you are doing is the best. The frame is a VERY big gauge "wire" and there would be no decrease in resistance or anything by running a longer ground wire all the way to the battery.