Wiring Harness Help

stickman · 08-20-2006, 05:56 PM

I just spent the day pulling my old dry rotted wiring harness on my 240tic. Everything was going smoothly until I got to the branch that goes under the block to the alternator. I've got 4 wires (red, red, black, and green). The heavy gauge red to the alternator was obvious, but I'm not sure about the others. The old harness isn't much guidance since the shielding was rotting off. Anybody know which wire goes where?

BrickBaller · 08-20-2006, 08:14 PM

Black and green go to the oil pressure sender unit just forward of the oil filter and just behind the alternator. Big spade on the big terminal, small on the small one.

Big red goes to + terminal on alternator and don't forget the ground strap for the alternator.

Small red wire goes to the exciter terminal on back of alternator, called the 61/B+ terminal or something like that.

stickman · 08-20-2006, 09:37 PM

Thanks for the info. I try that out tomorrow PM after work.

Where does the ground strap go? When I was pulling the harness, there was an extra snippet of wire on the + terminal on the alternator, but I could not find the other end.

dl242gt · 08-20-2006, 10:22 PM

The ground strap for the alternator attaches to one of the studs that hold the case of the alternator together. One of the studs is longer and uses an extra 8mm size nut to hold the wire on. It goes from there to the bracket bolt on the engine. It's usually blue if there are some pieces of it's insulation left.

stickman · 08-20-2006, 11:01 PM

I'm ok on the ground strap then. The blue wire is intact (amazingly).

Mr. V · 08-21-2006, 11:14 AM

The ground strap should bolt onto one of the bolts for the engine mount assembly.

Clean it all up for a sound connection.

08-20-2006, 05:56 PM	#1
stickman Board Member Join Date: Mar 2006 Location: Kingston Springs, TN	Wiring Harness Help I just spent the day pulling my old dry rotted wiring harness on my 240tic. Everything was going smoothly until I got to the branch that goes under the block to the alternator. I've got 4 wires (red, red, black, and green). The heavy gauge red to the alternator was obvious, but I'm not sure about the others. The old harness isn't much guidance since the shielding was rotting off. Anybody know which wire goes where? __________________ Brickless at the moment... Last edited by stickman; 08-20-2006 at 06:02 PM..

08-20-2006, 10:22 PM	#4
dl242gt Old and boxy but good. Join Date: Jun 2002 Location: S NJ, a suburb of Phila.	alternator The ground strap for the alternator attaches to one of the studs that hold the case of the alternator together. One of the studs is longer and uses an extra 8mm size nut to hold the wire on. It goes from there to the bracket bolt on the engine. It's usually blue if there are some pieces of it's insulation left. __________________ Dave, 1982 242 turbo. 338k miles. MVP coilovers and 3" exhaust. Flowed 405 with a V15. Cossie turbine housing with upgraded compressor housing. 90+, IPD remote oil filter. Some other goodness, too. Been lots of fun over 25 years. Restored in 2k. Now ready for a 2nd restoration. 1993 245 Classic, 440k miles, enem V15. IPD bars and chassis braces. Simons sport exhaust from Scandix. sbabbs ezk chip. Been a good road warrior. Genuine Volvo rebuilt leaky M47.

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08-20-2006, 09:37 PM	#3
stickman Board Member Join Date: Mar 2006 Location: Kingston Springs, TN	Thanks for the info. I try that out tomorrow PM after work. Where does the ground strap go? When I was pulling the harness, there was an extra snippet of wire on the + terminal on the alternator, but I could not find the other end.

08-20-2006, 11:01 PM	#5
stickman Board Member Join Date: Mar 2006 Location: Kingston Springs, TN	I'm ok on the ground strap then. The blue wire is intact (amazingly).

08-21-2006, 11:14 AM	#6
Mr. V Board Member Join Date: Jul 2004 Location: Portland, Oregon metro	The ground strap should bolt onto one of the bolts for the engine mount assembly. Clean it all up for a sound connection.