park, dome, brake lights problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gabe2000 · 05-11-2011, 11:14 PM

I am putting my 64 GMC back together and still tackling one problem after another.

Now the park, dome and brake light will not turn on. Please help. The headlight switch is new and the headlights and instrumental dashbroad light do work.

Any Ideas?

**slepysal** · 05-12-2011, 12:59 AM

Did they work before? It could be a couple of things, as simple as bad bulbs or bad grounds. On my dome light one of the wires was cut , and on my brake lights the plug that conects to the cab was bad,and on my parking lights the fire wall plug was loose. It took a while with a test light to find it out.

Use a test light at the head light switch and see if the dimmer reostat (sp) is working ( even if it is new) check the dome light to see if there is any power to it.

Are the rear running lights working? Do the front turn signals work?
The parking lights do not work if the head lights are on, they come on only when the headlight switch is pulled 1/2 way out. Hope this helps a bit

gabe2000 · 05-12-2011, 02:21 PM

before I take my apart, they did worked. The dimmer on the instrument dash broad do work.
But signal light, park or dome or brake. I'll check for grounding issue.

**slepysal** · 05-12-2011, 04:47 PM

Check the plug conections sound like they may be loose.

slorio · 05-12-2011, 05:16 PM

gabe2000:
My 1966 GMC does that when the fuse loses its connection in the fuse box. Those three are on the same circuit. Check with a volt meter with the positive probe on each side of that fuse in the box as you turn on the dome light. I think you will see the 12V dropping off on one side of the fuse. If so, take the fuse out and use some sandpaper on the fuse terminals to get a better connection, then put the fuse back in.
Regards,
Steve
New Orleans

gabe2000 · 05-12-2011, 05:27 PM

Thanks for the suggestion. I'll try next week.
we finally got some decent rain after 4 months back in Dec. or January.

**Clyde65** · 05-12-2011, 05:14 PM

check the diagram again

noxided · 05-13-2011, 02:28 PM

yeah its all wet here now, been needin that.

I just rewired a 63 and had nothing but ground issues.

If you think you have enough good grounds, you dont, add more.

05-11-2011, 11:14 PM	#1
gabe2000 Registered User Join Date: Jul 2010 Location: austin,tx Posts: 165	park, dome, brake lights problem I am putting my 64 GMC back together and still tackling one problem after another. Now the park, dome and brake light will not turn on. Please help. The headlight switch is new and the headlights and instrumental dashbroad light do work. Any Ideas?

05-12-2011, 12:59 AM	#2
slepysal Registered User Join Date: Oct 2006 Location: San Jose NOR*CAL Posts: 3,080	Re: park, dome, brake lights problem Did they work before? It could be a couple of things, as simple as bad bulbs or bad grounds. On my dome light one of the wires was cut , and on my brake lights the plug that conects to the cab was bad,and on my parking lights the fire wall plug was loose. It took a while with a test light to find it out. Use a test light at the head light switch and see if the dimmer reostat (sp) is working ( even if it is new) check the dome light to see if there is any power to it. Are the rear running lights working? Do the front turn signals work? The parking lights do not work if the head lights are on, they come on only when the headlight switch is pulled 1/2 way out. Hope this helps a bit __________________ 1960 Apache long bed fleet L6 250 Clifford intake 2 bbl carb. Langdon cast headers with dual exhaust and bellflower tips. T-5 5 speed, power steering and power disc brakes. "Over, Around or through it... " Last edited by slepysal; 05-12-2011 at 01:01 AM.

05-12-2011, 02:21 PM	#3
gabe2000 Registered User Join Date: Jul 2010 Location: austin,tx Posts: 165	Re: park, dome, brake lights problem before I take my apart, they did worked. The dimmer on the instrument dash broad do work. But signal light, park or dome or brake. I'll check for grounding issue.

05-12-2011, 04:47 PM	#4
slepysal Registered User Join Date: Oct 2006 Location: San Jose NOR*CAL Posts: 3,080	Re: park, dome, brake lights problem Check the plug conections sound like they may be loose. __________________ 1960 Apache long bed fleet L6 250 Clifford intake 2 bbl carb. Langdon cast headers with dual exhaust and bellflower tips. T-5 5 speed, power steering and power disc brakes. "Over, Around or through it... " Last edited by slepysal; 05-12-2011 at 04:49 PM.

05-12-2011, 05:16 PM	#5
slorio Registered User Join Date: Sep 2006 Location: Louisiana Posts: 375	Re: park, dome, brake lights problem gabe2000: My 1966 GMC does that when the fuse loses its connection in the fuse box. Those three are on the same circuit. Check with a volt meter with the positive probe on each side of that fuse in the box as you turn on the dome light. I think you will see the 12V dropping off on one side of the fuse. If so, take the fuse out and use some sandpaper on the fuse terminals to get a better connection, then put the fuse back in. Regards, Steve New Orleans

05-12-2011, 05:27 PM	#6
gabe2000 Registered User Join Date: Jul 2010 Location: austin,tx Posts: 165	Re: park, dome, brake lights problem Thanks for the suggestion. I'll try next week. we finally got some decent rain after 4 months back in Dec. or January.

05-13-2011, 02:28 PM	#8
noxided Registered User Join Date: Dec 2010 Location: montgomery texas Posts: 65	Re: park, dome, brake lights problem yeah its all wet here now, been needin that. I just rewired a 63 and had nothing but ground issues. If you think you have enough good grounds, you dont, add more. Last edited by noxided; 05-13-2011 at 02:29 PM.



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