DeTomaso Mailing List: May 98, Message #117

-- [ From: forest * EMC.Ver #2.5.3 ] --

Thought this would be too late but maybe not. Start by verifying that
you have power to the brake light switch by probing with a test light on
the switch terminals. You should have power to one terminal (remember
that on Panteras you have to have the ignition switch on to get power to
the brake lights). If there is power to one side then have a helper push
on the brake pedal while you probe the other terminal. If no power, then
the switch is bad and needs replacement. My experience with the pressure
activated switches has been that they have a high failure rate. I have
converted to a GM switch which you can buy for a couple of dollars. Use
a piece of flat bar about 1/8 " thick by 3/4" or so wide and about 3
1/2" long. Drill a hole large enough for the switch to fit through at
one end and another hole about 2 1/2 " away that the pedal stop bolt
will fit through and bolt to the pedal support with the stop bolt. Find
the two  wires going to the stock switch and separate them from the
harness just inside the firewall. Connect these two wires to the new
switch and adjust the switch position such that  about 1/4" of pedal
movement allows the switch to close. This will fix the switch problem
forever, well almost.
If you did have power across the switch and the brake lights still do
not work then check the connector in the harness on the right side in
the engine compartment. If all OK there then check for power in the
socket itself. If power there then check grounds carefully.
If you had no power to the switch then you need to check at the fuse
panel. I believe that the gauges are on the same fuse so if they work
then I'm sure you have power to the switch. My guess is a bad switch as
I used to have to replace these switches twice a year or thereabouts.