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Electrical mayhem - what are these wires?

 
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mr_caarl  



Joined: 21 Mar 2019
Posts: 8
Location: Sweden

PostPosted: Tue Apr 16, 2019 8:14 pm    Post subject: Electrical mayhem - what are these wires? Reply with quote

Hi!

This is my first post and also my first Porsche 924. I recently picked up a 924 n/a -79 euro car with a 4 speed gear box.

The car is not exactly a beauty in its current shape but runs and drives great. Such a lovely little car!

First concern is the electrics. Much has been rewired (not for the better i would say) and some stuff has been disconnected.

Interior lights and gauges are not working or working on and off so i will check and clean the grounds hoping that helps.

However i have some wires that i havent been able to find in the Haynes manual yet. Maybe someone can help me identify these?

Wires in the picture are located in the engine compartment on the driver side (black/red and white/yellow).



There is also a solid green stray wire in the front of the car on the passenger side. Anyone know what that wire should connect to?
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scm924s  



Joined: 22 Oct 2010
Posts: 228
Location: Gloucester UK

PostPosted: Fri Apr 19, 2019 6:17 am    Post subject: Reply with quote

You should be aware that the Haynes manual was written for the US market (LHD and detuned) and is not helpful to owners of euro spec cars as there are quite a few differences. The 2 disconnected wires are normal, may be for a/c?
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1984 n/a Ruby Red Metallic
1988 924S Guards red- sold
1986 924S Guards Red - sold
1984 n/a Black - sold
1980 n/a Le Mans#1 - sold
1980 n/a Le Mans#2- sold
1977 Martini - sold
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morghen  



Joined: 21 Jan 2005
Posts: 8210
Location: Romania

PostPosted: Fri Apr 19, 2019 6:06 pm    Post subject: Reply with quote

All 924s have those wires. ignore them.
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Harm  



Joined: 02 Apr 2009
Posts: 1358
Location: Holland

PostPosted: Sun Apr 21, 2019 8:05 pm    Post subject: Re: Electrical mayhem - what are these wires? Reply with quote

…Just noticed the Danish 924 site is no longer up. Too bad.

Additional Wiring:
White/Yellow —— Extra (Fog) Lights.
Black/Red —— Headlight Washer Fluid Pump.

Good luck & Enjoy!
Harm.
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mr_caarl  



Joined: 21 Mar 2019
Posts: 8
Location: Sweden

PostPosted: Wed Apr 24, 2019 12:26 am    Post subject: Reply with quote

Sorry for late reply.

Big thanx to everyone! Atleast one less problem to worry about
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mr_caarl  



Joined: 21 Mar 2019
Posts: 8
Location: Sweden

PostPosted: Sat Apr 27, 2019 12:00 am    Post subject: Reply with quote

Hijacking my own thread.

According to the Haynes manual my -79 n/a euro car is suppose to have an ignition control unit.

However I cant find one and my ignition coil is wired from the (-) side with green (tacho signal), green/white (fuel pump relay signal) and black/yellow (fuel pump). My feeling is telling me the black/yellow (fuel pump) is connected on the wrong side of the coil or am I wrong? Should go to + on coil for extra boost at start up? Weirdly the car actually runs if i leave the jumpering of the fuel pump relay (I know.. previous owners.. ) in place instead of using an actual relay.

Is the lack of ignition control unit normal in the euro cars or did some previous owner scrap the ignition control unit?

My tachometer isnt working (cleaned the ground and positive, also tried rewiring with no luck) and iam not getting the correct signal from the coil to the fuel pump relay. Does anyone have a suggestion how to go from here?
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safe  



Joined: 18 Mar 2017
Posts: 175
Location: Sweden

PostPosted: Sat Apr 27, 2019 8:31 am    Post subject: Reply with quote

mr_caarl wrote:
Hijacking my own thread.

According to the Haynes manual my -79 n/a euro car is suppose to have an ignition control unit.

However I cant find one and my ignition coil is wired from the (-) side with green (tacho signal), green/white (fuel pump relay signal) and black/yellow (fuel pump). My feeling is telling me the black/yellow (fuel pump) is connected on the wrong side of the coil or am I wrong? Should go to + on coil for extra boost at start up? Weirdly the car actually runs if i leave the jumpering of the fuel pump relay (I know.. previous owners.. ) in place instead of using an actual relay.

Is the lack of ignition control unit normal in the euro cars or did some previous owner scrap the ignition control unit?

My tachometer isnt working (cleaned the ground and positive, also tried rewiring with no luck) and iam not getting the correct signal from the coil to the fuel pump relay. Does anyone have a suggestion how to go from here?


It should be a unit next to the coil on the fire wall on a 79.
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mr_caarl  



Joined: 21 Mar 2019
Posts: 8
Location: Sweden

PostPosted: Sun Apr 28, 2019 9:43 am    Post subject: Reply with quote

safe wrote:
It should be a unit next to the coil on the fire wall on a 79.


Okey, so the ignition module is missing Everything seems to be rewired in a not for the better way.

Thanx for the help everyone! I will leave the electrics as is for now and do a complete remake later on.
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