2500M: how gauges are grounded?

[Renaldo]

Guys, I'm continuing my education about auto electrics and have a question about how our gauges are grounded.

When I had my dash pulled out, the grounding for the gauges seemed to consist of black wires between each gauge.

My question is, does the grounding between the instruments, then ground, through one wire, to a single grounding point?

Please feel free to get out the chalk board and explain.

Merci.

Ron

[Grantura MKI]

The earths are run on a loop idea with a central connection to the chassis.
Regards,
David.

[Renaldo]

I also noticed what looked like a main grounding point, below the steering column, near the ignition switch.

Is this also the likely central grounding point for the gauges?

Ron

[Grantura MKI]

More than likely...depends how many previous people have been in there! The main grounding points are at the chassis near the bulkhead on both sides....follow the battery earths for a start. There are 1/4 bolts welded to the chassis...be sure these are clean.
Regards,
D.

[Renaldo]

D, I'll take a closer look. But those black wires that appear to link the gauges, is part of the "looping" ground that eventually attaches to one central ground? Have I got that right?

Ron

[Grantura MKI]

Yes, as long as your car was not wired completely in black! The earths are connected at the back of the dial via the stud and nut at the back side.
Regards,
D.

[Hansoplast]

IMO you should use bulb fittings with an (black) earthing thread.
This is better than earthing via the metal of the instruments.

It's a small change.
Or am I wrong?

Hans