What's in the workshop this week?

[27litres]

Originally Posted by HPsauce

My "theory" is that the Reverse circuit is the most vulnerable in that later design F125 because it actually takes all the current for the reversing lights.

Surely only GM (Holden) are silly enough to use switches in that manner!
My first car was a Holden VB Commodore (GM Opel Rekord/Senator hybrid bodyshell, thus the Opel type naval nomenclature), which was basically a Holden built and engined 1st generation Carlton.
On this car, the Ignition switch took full Starter Solenoid amperage, the headlight switch took full headlight amperage, the brake light switch took full brake light amperage, and the demister switch took full demister amperage.
All these switches were simple contact slide switches, prone to carbon scoring.
There was a single main feed wire into the (simple) fuse box, which was about the size of a stock 20amp wire (about 2 - 2.5mm core) which had to carry all this amperage.
I used to get pulled over by other motorists (almost never cops, surprisingly) to tell me my brake lights weren't working (remember that type of courtesy?), which developed my regular checks in shop windows and such which continues to this day!
My headlights yellowed, my demister switch started to melt, my alternator failed about 3 times.

By the time I sold it, every circuit just mentioned had relays in place and the main feed wire was a double 30amp wire!
Bright headlights, no more brake light switch failures, no more alternator failures!