Hello, Could someone post a pic or two of how the wiring harness

travels to the starter and alternator from the TB cover and around

the rack and heat shields on a 87 s4...Installing a new wire

harness and would like to get it right...


Thanks Bill

 

Hang on... I'll take some pictures for you... come back in a hour or so.

 

Your first challenge is removing the old front main engine (FME) harness. This picture - with the steering rack removed - shows the routing.

- in the center of the picture you see a harness clamp. This retains the FME against the engine support cross-member. It's a stone-cold bitch to unbolt that harness without stuff out of the way. It's a nut and bolt, you have to counter hold to turn it out. It's common to find this clamp missing if the engine support or engine has been out of the car.

- at the right you see another clamp. This is where the FME meets up with the main cable from the battery box.

- the FME is routed between the two power steering lines.

 

Freekin' attached thumbnails...

The clamp that was in the right in the first picture is now on the left. It bolts to the engine support cross member. Both the FME and main battery cables are routed in a "U" to the starter. There should be a two-inch piece of rubber gasket material on the cross member used to prevent chaffing of the harnesses. Also there should be a little bit of rubber on the oil pan just above and to the right of where the harnesses attach to the starter.

 

Next, here's the detail for the alternator.
- harness clamp on the block in the center top of the picture
- alternator branch makes a 'hanging u' with the branches to the oil pressure sender and oil level sender at the bottom.
- missing on the engine in the picture is a big yellow plastic clip that retains the alternator branch of the FME to the alternator shroud.

 

Next is the exit from the belt cover. The clamp that was top center in the previous picture is now bottom center right.
- the main branch with the 14-pin plug and the power line to the ABS pump come through the belt cover as shown.
- NOT shown, and damn hard to get a picture of, are the branches for the temp gauge sender and the intake temperature sender.
- those two branches are routed between the block and the metal timing belt backing plate.

 

Last, but not least, is the detail for routing the FME to the jump post.
- the FME routes under the right-side belt cover
- it's clamped to the right-side lift loop (most of these clamps are missing, cause it's a real challenge getting that clamp bolted with the engine in the car (or, hint, with the lift loop attached to the block.)
- note the tight fit around the Hall sensor and its bracket (your '87 probably does not have a bracket to retain the Hall sensor.)
- if your Hall sensor's connector looks like the one in this picture then it's time for a new one.
- the clamp on the lift loop also retains the ground wire for the right-side coil.

HTH

 

Great, super helpful Thanks for your time and effort ......
Regards Bill

 

Yes thank you,am building a new harness and this will help.

 

My thanks too, Dave- this is one of my projects in the planning stage, and this info has given it a bump.

 

Great info dude...
Currently I am working with a 928 GTS, 1993.... & I am repairing the complete wiring harness, your post will help me a lot in routing...

 

@worf928 - Thank-you! thank-you! I am actually installing a new engine harness today and so your reply with pictures is timely and will be extremely helpful!
I appreciate it.
Yasin