Rutger Gert-Jan

Looking for a picture that shows the location of the (engine) ground strap.I am looking for thi pictures since I want to check if it is there..

I had some problems with the charging voltage on my 993, was only 12,9 Volts. So I had the alternator rebuilt but that dit not make a change, so I went back to shop that did the rebuild-> they measured a voltage loss between the engine and the negative battery terminal. For the moment the problem is solved by adding an extra wire between the alternator/fan housing and the AC compressor.

Thank you in advance!

IXLR8

There is a ground stud next to each rear suspension attach point in the engine compartment.

The main ground is pictured here...

ThomasC2

The ground strap for the alternator/engine sits behind the alternator fixed on a bolt on top of the crankcase. Not a 993 but it looks the same.

Thomas

IXLR8

On the older models that is the case, but on the 993, the ground strap connected at the alternator is part of the wiring harness and the other end attaches to the front end of the left cam tower via a larger lug containing other brown ground wires from within the engine harness.

The casing of the alternator is also grounded to the engine, but since the engine/transmission is rubber mounted, it needs that ground strap from the starter mounting bolt to the chassis as shown in the pic above.

But there is no harm in making and installing an extra near-zero ohms ground strap for the alternator. I don't trust wire crimps where the elements can get to them.

While you are in there * Alternator Cable thread for an older 911.

IXLR8

The engine grounding lug with numerous brown ground wires is located on the front left cam tower.

ThomasC2

Aha, thought it looked the same as on my 964.

Thomas