Common link....

David Emmerich · Feb 18, 2009

The other day I had to go up into Ohio in a snow storm...About half way home the overdrive and the Cruse control both quit...and the left brake light came on dimmly. I have been checking what wires I can identify under the dash, in the rear, etc and I have found that on the wire leaving the Brake sw, with the peddle NOT pushed, and the key off, I have 0 volts; with the key on, I have 5.3 volts, which I am thinking is enough for the ECU to think that the brake peddle is being pushed.

Anyone have an idea where that 5.3 volts is coming from???

David :icon_confused:

Earl43P · Feb 18, 2009

Disconnect and clean the plug directly under the driver seat, apply dielectric grease.

Clean ground G103, it's on the DS inner fender, almost to the hinge/ master cylinder area.

Remove the tail light lamps for brake light, see what that stray voltage does. Might be corroded sockets, but you'd have to be running parking lights for that to bleed volts to the brake lights. I'd start with that left one.

The only "Hot in Run" interaction I can find is turn signals, which I assume are not on, reverse lights, same condition, so I "don't think" you have a MultiFunction switch problem.

You might also check that voltage at your trailer connector. Another easy way to isolat the rear (besides disconnecting under the Driver seat) is at the middle of the back of the bed. There is a connection there to disconnect the rear light harness for bed remmoval. IF it goes away with that disconnected, suspect a light socket corrosion issue or bad trailer connector.

If you PM me your e-mail address, I'll send you schematics (93, but it should be exact same).

Common link....

David Emmerich

10+ Year Member

Earl43P

15+ Year Member

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