This should be a nice, simple inquiry. Can someone please tell me what this black & red wire with the inline fuse is and where it is to be connected?

 

I had that too, and was told it was for the original car phone. I ripped it all out, no adverse consequences. Not crazy about that battery post work around.

 

Saskatoon defibulator magnetron?? It does look after-market, so I wouldn't know what it powers. It doesn't really matter where it is bolted, assuming it gets 12V positive, which we assume it does. If all of your "stuff" is working, I would tape it off and fold it out of the way. Of more concern is that nothing from the +post touches the top or sides of the batt box. Some strategically placed plastic might be good since that hook-up is a little wide. Also, I've seen burn marks on the inside top cover directly over the + post that are evidence of a battery not secured properly. Not saying yours isn't.

 

This is the standard stock hot post connector on the later cars. It powers several things directly from the battery (several unfused) - For example - the EZK & LH supplies, the dual cooling fans, the ABS brain, the PSD (if equipped).

Agree the inline fuses are probably for a defunct Telephone or CD changer. Possibly aftermarket gear too - I'd try to trace the wiring.

Alan

 

Wow - did the hot post connector come with a shroud of any sort?

 

On my car I have leads from the battery poles going to a charge socket under the license plate,so its easy to fit/remove a charge lead. I have a fuse on the + line to protect the wiring from accidents....This stuff looks similar,if a bit heavier than I would have used.
jp 83 Euro S AT 52k

 

Laird.............your daughter has it hot wired for when mum and dad go to bed.

Be careful my friend

 

You will note the battery has a folding cover over the post - the connector here is just laying on top of that cover... its normally well below flush with the top of the battery (as long as it seated correctly and bolted down tight.

Alan

 

The two holes you see are there for the two pins on the folding cover, the other side of which clamps over the short side of the battery.

 

The battery that came in my '90 had no little plastic folding cover, and I made a nice spark when I closed the battery cover properly for the first time (wondered why the PO left the spare out of the car with the cover unlatched....) . I put a section of alternator belt over the three terminals until that battery went belly up and the replacement Bosch had such a cover.

 

I had no idea that the positive terminal would generate such interest. I'd just assumed that the convoluted setup with the 3 auxillary connections was a standard, if unusual, 928 feature. As for a cover over the positive terminal, the old battery did have a plastic one. This new battery didn't come with one, however, the old one does fit nicely into the holes noted by Aryan. The posts are actually recessed from the top of the battery, so that, along with the plastic cover and the piece of rubber affixed to the bottom of the battery cover door should assure that we don't have any arcing from the positive terminal once the positive lead is actually connected to the post.

My interest lay more with the spare wire initially identified in the photos. The black jacket with the red stripe had me questioning whether or not this actually belonged on the positive terminal, or if, in fact, this was to be grounded.

Malcolm, as for one of my daughters hot wiring the car, I have no concerns, as this if too technically complex for them. Now, as for my 17 year old son...

ps: It's the middle of May and my car is up on jack stands in the driveway and covered in snow. I wish Spring would show up.

 

A black wire with red stripe is typically a Porsche color for a secondarily switched ignition positive supply (Black is an ignition supply). So this would usually be an ignition fed supply with an additional switch in the circuit. Normally this would not be connected directly to the battery.

Its possible its not stock wiring in which case the colors could mean anything... Fuses are almost always placed in positive supplies (and should be).

Note that on a Porsche stock grounds are always Brown.

Alan

 

Thanks Alan. That's exactly the type of information I was looking for.