Open Road

removed this original analogue clock from the 90 S4 + its original wiring loom and connector and it has the usual 12v, earth and 12v for the light + a wire in the connector- the black one in the pictures- that is "not used " according to the pictures i have seen on the www.
anybody know what why the clock would need this wire ?
flux capacitor ?
cheers
Phil

Red is 30 Bus 12v
Black is 15 Bus 12v

Black/Blue is …. dimmer?

Have you looked at the wiring diagrams?

was being lazy
had it hooked up to a battery with just the red and brown wires and it kept perfect time for the last 6 hours which is a good start, new bulb and that now works
will check the wiring diagram, thanks Dave
cheers
Phil

h2pmr wrote: ↑Sat Dec 30, 2023 2:37 pm was being lazy

lol. me too.

i just hooked it up to a battery, brown on earth then tried all other combinations of 12v on the other 3 wires and the black one alters nothing, as it comes from the light switch i thought it might light the bulb to possibly keep it illuminated as a belt and braces approach but light only comes on with the blue/black wire at 12v
BUT
12V on blue/black wire = 0.5V on black wire
0V on blue/black = 0V on black wire
its sending a 0.5V signal OUT on the black wire
or there is a fault on the black wire circuit inside the clock
cheers
Phil