[DeTomaso] No brake lights

[Forest Goodhart]

 If you short the wires together you do not need to press the brake pedal. I would start by testing for power to at least one of the connections to the brake light pressure switch. The ignition switch needs to be in the on position also for the brake lights to work. If you have power to one side then have someone push the brake pedal and check for power to the other terminal. If no power then the switch is bad. I have replaced this switch several times as they seem to fail and I have found nothing other than the vendor supplied switches that fit.Let us know what you find.GForest
    On Thursday, November 25, 2021, 09:27:19 AM PST, Doug Braun <doug351c at gmail.com> wrote:  
 
 Konrad,

The pink wires are for lighting the "BRAKE" fluid pressure imbalance warning light on your dash so they're not the culprit for your brake lights not working.

But the wires that go to the brake pressure switch under the brake booster can be the cause of this.
On the later cars one wire to this switch is RED and the other is a RED/BLACK tied to a GRAY wire on a common connector.
On the earlier cars the GRAY wire isn't present since this one goes to the later car's Emergency Interlock box under the dash.

A common problem is for this Brake light switch, which works on brake fluid pressure, to fail.  You can test this by shorting its 2 wires together while someone else presses the brake pedal, while someone else looks at the brake lights (requires 3 people! Or 2 people and a mirror to watch the lights).

Doug Braun
Blue 73L #5505
 

-----Original Message-----
From: DeTomaso On Behalf Of Konrad Szwab
Sent: Wednesday, November 24, 2021 5:09 PM
To: detomaso at server.detomasolist.com
Subject: [DeTomaso] No brake lights

So I drove my car home (thank you all for the great suggestions and parts links), there is a large message with some pics awaiting moderation.

Ran great, but I have no brake lights. There seems to be a broken spade connector in the front trunk that has two pink wires and a white (and black I think) wire disconnected.

I am planning to trace some wiring tomorrow from the pressure switch near by the brake balancing valve.

Could that disconnected wire cause the no brake lights condition ?

Thanks,

Konrad

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-------------- next part --------------
   If you short the wires together you do not need to press the brake
   pedal. I would start by testing for power to at least one of the
   connections to the brake light pressure switch. The ignition switch
   needs to be in the on position also for the brake lights to work. If
   you have power to one side then have someone push the brake pedal and
   check for power to the other terminal. If no power then the switch is
   bad. I have replaced this switch several times as they seem to fail and
   I have found nothing other than the vendor supplied switches that fit.
   Let us know what you find.
   GForest

   On Thursday, November 25, 2021, 09:27:19 AM PST, Doug Braun
   <doug351c at gmail.com> wrote:
   Konrad,
   The pink wires are for lighting the "BRAKE" fluid pressure imbalance
   warning light on your dash so they're not the culprit for your brake
   lights not working.
   But the wires that go to the brake pressure switch under the brake
   booster can be the cause of this.
   On the later cars one wire to this switch is RED and the other is a
   RED/BLACK tied to a GRAY wire on a common connector.
   On the earlier cars the GRAY wire isn't present since this one goes to
   the later car's Emergency Interlock box under the dash.
   A common problem is for this Brake light switch, which works on brake
   fluid pressure, to fail.  You can test this by shorting its 2 wires
   together while someone else presses the brake pedal, while someone else
   looks at the brake lights (requires 3 people! Or 2 people and a mirror
   to watch the lights).
   Doug Braun
   Blue 73L #5505
   -----Original Message-----
   From: DeTomaso On Behalf Of Konrad Szwab
   Sent: Wednesday, November 24, 2021 5:09 PM
   To: [1]detomaso at server.detomasolist.com
   Subject: [DeTomaso] No brake lights
   So I drove my car home (thank you all for the great suggestions and
   parts links), there is a large message with some pics awaiting
   moderation.
   Ran great, but I have no brake lights. There seems to be a broken spade
   connector in the front trunk that has two pink wires and a white (and
   black I think) wire disconnected.
   I am planning to trace some wiring tomorrow from the pressure switch
   near by the brake balancing valve.
   Could that disconnected wire cause the no brake lights condition ?
   Thanks,
   Konrad
   _______________________________________________
   Detomaso Email List is not managed by POCA
   Posted emails must not exceed 1.5 Megabytes
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   or approve the archiving of list messages.

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