The brake wire is bare 6" or so from the taillight, just before it
hits this new trailer harness. I'm probing there and grounding to the
alternator. It drops to zero once the petal is released. I'm going to
try it your way tomorrow at first light (as well as checking the
switches and the junction box).

Chris

On 12/25/05, mark drillock <drillock@earthlink.net> wrote:
> Where exactly are you putting each of the meter probes?
> Does it drop to zero volts when the pedal is released?
>
> The brake switches are doubled up for safety. It is unlikely they would
> both be bad. The problem is far more likely to be in the left taillight
> area or the engine compartment wiring junction box. There are 2 round 7
> pin connectors in the box. One of these has all the wires for the rear
> lights. The brakelight wire is black/red stripe.
>
> Using a straight pin, push the pin into the wire. Push through the
> insulation and aim for the center where the metal is. Measure the
> voltage on the pin while someone pushes the brake pedal down hard. Put
> one probe on the pin and the other probe on bare metal ground in the
> engine compartment. On the same round connector are 2 wires that are
> grey with a stripe. These should have 12 volts when the headlight switch
> is on. Push the pin into one of these to verify your test setup. If you
> can't find 12 volts on one of these then you are doing something wrong
> and not finding 12 volts on the brake wire won't mean much.
>
> Mark
>
> Christopher Gronski wrote:
>
> >Right now I'm only getting 1 volt at the brake lights with the pedal depressed.
> >
> >Chris
> >
> >
>
>
>