Brake dash light fault help (1 Viewer)

[RustyBox]

I'm troubleshooting a dash light that is always on and have two questions:
1) does the brake fluid reservoir float "open" or "close" the circuit when it is lifted (e.g. when fluid is at correct level)?
2) does anyone have a wiring diagram for this circuit or know where I can find one?

I picked up a 60 series a little while ago and the dashboard "brake" light is always on. I attempted to troubleshoot it and I think I may be fighting multiple faults. About all in could verify was that the parking brake switch itself works. Checking resistance across the two wires leading to the fluid reservoir float doesn't seem to change when the float moves (circuit is always open / resistance off the charts). If I unplug the float switch and short the plug leading to the wiring harness, it doesn't change anything, regardless of position of the handbrake. Same if the float is unplugged and not jumpered.

Naturally, I removed the bulb from the dash

Any other thoughts on how to figure this out?

 

[4runner2FJ60]

Ive been through this issue recently. I was trying to make mine work again (why not?) Mine was a combination of the bulb holder/socket being broken and the little switch went bad under the E-brake handle. Pretty common w 40 year old LC. Rear brake light switch under pedal also goes bad. It is most likely your e-brake switch IMO!

 

[DrRock]

I'm troubleshooting a dash light that is always on and have two questions:
1) does the brake fluid reservoir float "open" or "close" the circuit when it is lifted (e.g. when fluid is at correct level)?
2) does anyone have a wiring diagram for this circuit or know where I can find one?

I picked up a 60 series a little while ago and the dashboard "brake" light is always on. I attempted to troubleshoot it and I think I may be fighting multiple faults. About all in could verify was that the parking brake switch itself works. Checking resistance across the two wires leading to the fluid reservoir float doesn't seem to change when the float moves (circuit is always open / resistance off the charts). If I unplug the float switch and short the plug leading to the wiring harness, it doesn't change anything, regardless of position of the handbrake. Same if the float is unplugged and not jumpered.

Naturally, I removed the bulb from the dash

Any other thoughts on how to figure this out?

Where in CT are you? I’m in the NW corner and have a 60 that is operating correctly for both circuits ( e brake and master cylinder sense). Happy to discuss here and provide some info.

Cheers, James

 

[RustyBox]

Where in CT are you? I’m in the NW corner and have a 60 that is operating correctly for both circuits ( e brake and master cylinder sense). Happy to discuss here and provide some info.

Cheers, James

Opposite corner! Down by New London. What's puzzling is I can't get the light to go off with any combination of disconnecting and/or shorting out the switch plugs.

 

[4runner2FJ60]

Both ends? At master cap and e-brake switch? There is a plug the brake switch plug into also. You might need to check continuity of wires, could be a brake somewhere?

 

[DrRock]

Opposite corner! Down by New London. What's puzzling is I can't get the light to go off with any combination of disconnecting and/or shorting out the switch plugs.

Bummer. As others have said, maybe there is a break somewhere?

 

[4runner2FJ60]

I can't believe I forgot to mention this......the light stays on until you start your truck!!!! In case you have been just using the key to check in ACC position, brake light will always be on.