Brake warning system mystery wire

gbvona

gbvona

Member
This may be relevant only to NADA 3500S cars. From 1970. Built on a Tuesday.

The brake warning light lines that go to the reservoir on the servo side (right side, for these export cars) has four wires. One is a ground. Two are married to one connector, presumably reflecting parallel lines to other warning switches. There is then a brass spade connector that piggybacks a fourth line to the two-line connector. The fourth line is blue vinyl and it goes hareing off through the firewall on the right side. It seems neatly done so is presumably a factory modification.

What is it? Can't see a blue wire on any of the diagrams.

gbvona
 
gbvona said:
This may be relevant only to NADA 3500S cars. From 1970. Built on a Tuesday.

The brake warning light lines that go to the reservoir on the servo side (right side, for these export cars) has four wires. One is a ground. Two are married to one connector, presumably reflecting parallel lines to other warning switches. There is then a brass spade connector that piggybacks a fourth line to the two-line connector. The fourth line is blue vinyl and it goes hareing off through the firewall on the right side. It seems neatly done so is presumably a factory modification.

What is it? Can't see a blue wire on any of the diagrams.

gbvona
Click to expand...

If it's solid blue, well any blue actually, it's unlikely to be a factory wire. Blue is used for lighting circuits.

Yours
Vern
 
I think it's factory. It has a nice sleeve on it and the spade connector is machine-crimped, not squashed with a hand tool. It's a kludge, but a nicely done kludge.

gbvona
 
gbvona said:
I think it's factory. It has a nice sleeve on it and the spade connector is machine-crimped, not squashed with a hand tool. It's a kludge, but a nicely done kludge.

gbvona
Click to expand...

Still, it's not a correct colour for a warning related wire. It may well be be factory made, but I doubt it's the same factory that made the car. If that's the connection on the brake fluid level switch you are describing, then the blue wire can do nothing except turn the warning light on if it were grounded. The other warning switch on that circuit should be the handbrake switch, perhaps it's to replace that wire.

Yours
Vern
 
hi, is there any continuity with an earth, is there a voltage on it??? where could the lead realistically reach that's to do with the braking system? if it looks like it is a warning light and there is no voltage or earth then short it to earth and see if a light comes on
hope this helps
coop
 
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