Hi,
do anyone know where all the ground connections are?(except the obvius at the battery and engine)
I have just rebuilt my alternator,and the voltage meter shows close to 14 V again.
When i put on the lights there is immediately a drop to 12,5-13 V .
Same when the warninglight in the POD are flashing, the meter is pulsating with the light.
Cleaned all the fuse and relay connections.
Could it be the + cabel from battery that needs to be renewed?
Greatful for hint's were to look.

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There is a ground strap from the engine (near the motor mount) to the body on the passenger side. There are also a bunch of wires that are grounded above the fuse panel. Also in the rear passenger side under the tool kit there are some more grounds.
Before you go nuts I would check the voltage with a good meter. The dash voltmeter usually isn't accurate.
How's your battery?
Good luck.

 

81' M/Y 'S' model?
Not hacking on you, but wondering when the S modle was introduced...
John S.

 

Corroded relays, fuses and bad grounds cause electrical phantom problems.

Low battery voltage or bad grounds, overcharging and undercharging alternator can cause an erratic computer control. Any input sensor, example, TPS, CTS (coolant temperature sensor), relay can malfunction or give a wrong reading under these conditions. With the ignition off turn on the headlights for one minute after one minute turn the headlights off; connect DVOM set to DC volts, negative lead to negative post, positive to positive. A fully charged battery should read 12.6 volts. Anything lower than 12.3 volts, you will need to charge the battery, with the main cables disconnected. With the meter connected to the battery positive-to-positive, negative-to-negative, start the engine; turn on the headlights, heater fan, and radio. This puts a load on the system. You should see 13.5 volts to 14.4 volts. Anything under 13.5 volts could be a bad alternator, bad diode, bad ground or high resistance in the positive cable. Anything over 14.5 volts is an overcharging alternator. With the car still running, lights and accessories still on, place the negative lead of the meter to the negative lead of the battery post, place positive lead of the meter to all of the ground wires. No more than 0.10 volts should read on the meter. A good ground is 0.00 or 0.01 volts. If you have 0.20 or more you have a bad ground wire. You can use a jumper wire for the negative lead of the meter to the negative lead of the battery post, so you can reach the engine compartment. Just be careful and use common sense when working in the engine compartment when the engine is running. You should check the alternator output directly at the alternator with the car running and all accessories on.
Make sure you have the decimal in the right place on your meter.


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There is also a grounding point under the steering column. Good Luck!
Anthony Tate
79/928 Silver Metallic

 

[quote]81' M/Y 'S' model?
Not hacking on you, but wondering when the S modle was introduced...
John S. <hr></blockquote>

1980-1983 there were S model's in Europe. Some of us are lucky to have an imported one in the US!
300hp 4.7l CIS
Great cars

 

John and Steve,
thanks for your advice.
Will try cleaning all grounds that i can find this weekend.
Does anyone know were the ground for the headlights are?

/Peter

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