Author Topic: Break Lights/Wireing  (Read 1837 times)

Offline 197

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Break Lights/Wireing
« on: March 16, 2008, 09:09:57 PM »
Tonight I went to drive my truck 73' C20 454. When I turned the headlights on all I got was Headlights and front marker lights. No Flashers, Break, Tail or Blinkers. I replaced the brake light fuse and got brake lights and blinkers but still no Tail Lights?

Tips?

Anyone have a wiring digram?
'73 C20 454

Offline 76_Scottsdale

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Re: Break Lights/Wireing
« Reply #1 on: March 17, 2008, 01:02:41 AM »
I would try replacing the flasher cans
1976 Scottsdale K20
350 C.I.D.
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305/70/R16 BFG MT
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Offline joesgarage71

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Re: Break Lights/Wireing
« Reply #2 on: March 17, 2008, 10:39:10 AM »
  There might be a wire grounding out in the rear or on the frame to make the fuse blow. check the harness conections too.
« Last Edit: March 17, 2008, 10:41:03 AM by joesgarage71 »
78' K-20 355/SM465/twin stick 205 6" on 36's
14 bolt FF/big bearing Dana 44 4.56 gears

92' GMC C-1500 454/4L80E/14 bolt

Offline 197

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Re: Break Lights/Wireing
« Reply #3 on: March 17, 2008, 07:53:10 PM »
Update: When ingtion is on and I turn a blinker on they all flash like the hazzards. If I turn the headlights on with the blinker on it will either flash slow or go solid dim. With the light on I have front marker lights and headlights nothing else on the exterior.

Could it be the turn signal switch?
'73 C20 454

Offline VileZambonie

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Re: Break Lights/Wireing
« Reply #4 on: March 17, 2008, 08:12:40 PM »
unplug the tail light connector and see what it does.
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Offline 197

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Re: Break Lights/Wireing
« Reply #5 on: March 17, 2008, 08:25:40 PM »
Did that, its getting power there.
'73 C20 454

Offline VileZambonie

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Re: Break Lights/Wireing
« Reply #6 on: March 17, 2008, 08:28:00 PM »
no, unplug the rear harness connector near the tailgate. Then see what happens when you turn on your lights, signals etc. with the rear lamps out of the picture.
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Offline 197

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Re: Break Lights/Wireing
« Reply #7 on: March 17, 2008, 08:43:50 PM »
With the rear unpluged the front lights work like they should.
'73 C20 454

Offline VileZambonie

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Re: Break Lights/Wireing
« Reply #8 on: March 17, 2008, 08:44:49 PM »
OK so check each bulb socket and make sure the ground wires at each side are clean and tight.
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Offline 197

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Re: Break Lights/Wireing
« Reply #9 on: March 17, 2008, 09:07:27 PM »
Thanks! It was the left side that wasn't grounded correctly.
'73 C20 454