Ok, my '83 944 N/A has an assortment of little electrical gremlins that I've been trying to flush out off and on for a month now, and I'm still having a few problems. I've seen it mentioned on a number of occasions around here that cleaning the ground points can be a good way to handle a lot of these kinds of problems, which leads me to my question:

What are the main ground points that you'd clean just on general principle?

I'm looking for the ones that are common sources of problems and such. The problems I've got aren't severe or localized enough to need to look at all of them specifically (except that my backup lights won't come on, but I haven't really looked into that one yet...)

 

Here is a start.

 

is there a difference between the points for early/late cars or variants of the 944 like s/s2/turbo or does that diagram work for all years/variants

 

Testarossa- Thanks! That's great!