No brake lights or rear hazards

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Rookie
United States of America
Posts: 30
Joined: Tue Nov 24, 2015 2:24 pm

No brake lights or rear hazards

Post by Rookie » Sat Nov 11, 2017 4:10 pm

I know its been covered before i was up late reading thru all like 10 pages on the electrical section. I have breaker 12 popping.im not really good on diagnosing electricals but learning i believe its the hazard switch so i ordered one if anyone wants to chime in with some of your previous experiences with this that will be great.its a 1973 712 m with petronix everything was working well till yesterday checked the brake switch for continuity and there is thanks in advance guys

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pcolette
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Location: Southwest Wisconsin

Re: No brake lights or rear hazards

Post by pcolette » Sat Nov 11, 2017 6:10 pm

Under the rear of the body mounted on the body toward the passenger side of the tail cone is an electrical junction box for the rear lighting circuits. The original box was open to the weather and road debris. The wiring often corroded and shorted out. The newer junction box has a cover (photos attached). I'd look at that first for any obvious shorts, etc. After that I'd check that the rear lights have good grounds to the body, another notorious problem.
New Junction Box.jpg
New Junction Box.jpg (464.97 KiB) Viewed 350 times
Inside New JB.jpg
Inside New JB.jpg (333.3 KiB) Viewed 350 times
Paul C.
_________
'73 Swiss 710M
'72 Swiss 710M (For Sale)
'89 Puch 230GE
2002 MB G500 (For Sale)

Rookie
United States of America
Posts: 30
Joined: Tue Nov 24, 2015 2:24 pm

Re: No brake lights or rear hazards

Post by Rookie » Sun Nov 12, 2017 8:14 am

Thanks pcoolette I will check that junction box.I did order a new one from sav just to eliminate that as a culprit.my flasher switch keeps on grounding out also and popping the fuse #12 I opened the flasher control moved some legs around that I thought were touching and no more spark but after using a few times it started popping again.if I disconnect the emergency flasher switch from the firewall and let it hang it doesn't pop the breaker.but I'm getting 24volts from the face of the switch the metal plate.i know it's simple but I'm not good at trouble shooting electrical systems

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GadgetPhreak
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Re: No brake lights or rear hazards

Post by GadgetPhreak » Sun Nov 12, 2017 12:43 pm

I have the old style exposed junction box and its coated in mud and debris.. I wasn't aware of the new style and haven't yet been successful finding it on the part drawing. Does anyone have a drawing/part number they could share please :)


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King County Search & Rescue | Regional Special Vehicles Unit
1972 710M - Building up for SAR use
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pcolette
United States of America
Posts: 1304
Joined: Sun Dec 10, 2006 7:38 pm
Location: Southwest Wisconsin

Re: No brake lights or rear hazards

Post by pcolette » Sun Nov 12, 2017 2:02 pm

Group 09-80-36, Part #7111850610
Paul C.
_________
'73 Swiss 710M
'72 Swiss 710M (For Sale)
'89 Puch 230GE
2002 MB G500 (For Sale)

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GadgetPhreak
United States of America
Posts: 263
Joined: Wed Jan 27, 2016 12:14 pm
Location: Redmond, WA
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Re: No brake lights or rear hazards

Post by GadgetPhreak » Sun Nov 12, 2017 7:50 pm

Thank you!!


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King County Search & Rescue | Regional Special Vehicles Unit
1972 710M - Building up for SAR use
Follow my build: http://www.facebook.com/sarpinz | http://instagram.com/sarpinz

Rookie
United States of America
Posts: 30
Joined: Tue Nov 24, 2015 2:24 pm

Re: No brake lights or rear hazards

Post by Rookie » Wed Nov 29, 2017 6:28 pm

Well guys im happy to say that got fixed now i have rear brake lights and rear hazards it was the emergency flasher switch after all.looks like the old one was grouinding out had a short inside the contacts somewhere that i couldnt see thanks for all the suggestions

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