Author Topic: Dual Bowl Conversion / Brake Light Switch / Battery Drain  (Read 3546 times)

heavy

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  • Posts: 19
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  • Mustang: '66 289
  • Location: Jacksonville, FL
Dual Bowl Conversion / Brake Light Switch / Battery Drain
« on: September 22, 2009, 09:02:50 PM »
I am posting this in the hopes it will save someone time troubleshooting a battery drain problem.  I started having an issue with the battery draining after I had a dual bowl master cylinder from CJ Pony Parts installed on my '66 289 Coupe. 

I TOLD THE COMPANY TO USE THE ORIGINAL PUSH ROD, AND THEY USED THE NEW ONE THAT IS NOT THE RIGHT SIZE.

The brakes work fine, but the wrong push rod is putting just enough pressure on the switch that it is slowly draining the battery without providing enough power to actually activate the lights.  I ran an Ohm test and you can see the circuit complete as you let go of the brake pedal and let it rest naturally.

Does anyone know if you can adjust the brake light switch, or do I need to get a stock push rod for a '66 and re-install it?  How frustrating....

Jeff73Mach1

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  • Posts: 471
  • Mustang: 1973 Mach 1
  • Location: Nashville, TN
Re: Dual Bowl Conversion / Brake Light Switch / Battery Drain
« Reply #1 on: September 23, 2009, 11:57:17 AM »
IIRC the switch is held in near the top of the brake pedal by a spring clip.

Try taking it out altogether and check to see if the switch is faulty and not closing altogether.  If the switch is good, I suspect you could just shorten up the plastic plunger part with a belt sander to provide enough clearance for it to go off when the pedal is released, or there may be another method to shorten it up.

 

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