NC928S4

Some PO installed an additional Alarm System because the Porsche Factory Alarm system was obviously inadequate. I'm trying to get "her" back to stock as much as possible and electrical mods are the first to go.

I see lots of splices which makes me nervous. Any tips are welcome.

michael j wright

I removed mine on a non factory alarm car. The first thing I did was to undo all tie straps and electrical tape so as to get as much of the system layed out as possible. I then proceded to find one wire at a time, cut out and remove the aftermarket alarm while at the same time rejoining the factory wires were they were spliced. Good luck.
Mike

Pcplod

^^^^^

I just finished doing the same as Mike to my 86.5 this week. The alarm system in mine was a pretty basic job though, so there weren't too many wires to dissect out of the system. Just take your time and double check your wires before you cut them out. Good luck!

JoeTaylor

+1 Take your time and the solution will appear. (Remember it wasn't put in by a brain surgeon.)

James Bailey

Note that the Porsche wiriing is color coded where as much after market is red and black...it is usually pretty obvious what was original.

jon928se

Is it just an alarm, maybe with remote control fob that disalarms (a word I just made up) and unlocks the doors or does it have an immobiliser as well.

If only an alarm it's relatively simple exercise of disconnecting the wires - none of the original loom should have been cut (maybe spliced onto but not cut)

If it's an immobiliser as well you'll need you detetctive skills to trace out where the fuel pump feed, starter feed and maybe ignition circuit feed have been cut and spliced into the original loom. Look for original many colours wiring loom wires spliced into just black wires.

BTDT three times now, it's just a question of being methodical and not being overwhelmed by what at first appears to be miles of black spaghetti

Tails

I would use the Electrical Drawing to identify the wiring, the connectors to the CE panel, the colour coded connectors and plugs, the the spare fuse holders used and I would also check behind the CE panel to see if any wiring has been cut or spliced into. Most or the wiring behind the CE panel is grey spagetti, but if you take your time and locate one wire at a time and repair or replace it ensuring you use the same colour and gauge thickness, you will get there in the end.

Don't attack all wires connected to the alarm at once or you will really run into trouble.

If you have the wiring diagrams, make a copy of the respective drawing and colour the circuits to match the original colour and when you isolate each circuit, double check before removal, cutting and joining.

Good Chinese saying is "slowley slowley catchie monkey".

Tails 1990 928S4 Auto