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10-09-2005, 02:03 PM
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#1 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,863
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Headlights Burned Out
I was leaving a friends the other night and he stopped me and said I had a light out.I got out and tapped it and wiggled the connector,didn`t help.Oh well,I figured I`d drive home on Hi-beams.Before I was through the gears,the lights flickered and both went out.So,I quickly hit the dims and same thing,flicker,no light.I had to turn around and go back and borrow a vehicle to get home in.The battery will run down overnight,so I`m disconnecting it.The battery feels warm when I do.What kind of electrical problem could this be?Some thing is shorted,I guess,and there must be too much current in the circuit.Has anyone run intoa similar problem.This is a`72.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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10-09-2005, 02:15 PM
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#2 | |
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20' Daredevil (Ret)
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,535
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Quote:
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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10-09-2005, 02:18 PM
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#3 |
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Junior Member
Join Date: Mar 2005
Location: Maryland
Posts: 129
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Two things...
First, most common problem is a bad voltage regulator(internal or external). Charging voltage as high as 17-18v will pop some bulbs! Second is bad diodes in the alternator will allow AC voltage to pass through and most DC componants don't like it. Bad diodes will kill the battery in two ways. Diodes will have a draw when engines off and AC voltage will fry it also.
Either way, you replace the alternator! Scott
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'67 SWB big block project '85 C60 school bus motorhome conversion |
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10-09-2005, 02:31 PM
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#4 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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The draining of the battery overnight is another sign of a messed up charging circuit.
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10-09-2005, 02:35 PM
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#5 |
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Special Order
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,863
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Thanks,that was quick!It`s still got the external voltage reg.Nothing else is burned out,yet.I`ve driven it a little since and even with the parking lights on some.I`ll test that out.What`s the benefit of goung to a one wire/internal set-up?Less wiring?It seems everyone I know goes that route.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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10-09-2005, 02:37 PM
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#6 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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screw the one wire, just get a GM 3 wire. Cheaper, better, easy to find, cheap to replace.
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10-10-2005, 01:09 PM
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#7 |
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Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,052
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I had the same thing happen to me. Only I was 2 hours north from home. A guy that had saw me at a car show that morining 2 hours south noticed my truck anmd took me to his shop. We found the lights in his 55ish ford were the same T3's. Well I made it home with one low beam left.
It was the Alt I changed it no more problems.
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1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD |
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10-10-2005, 05:02 PM
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#8 |
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Black 72 Chevy
Join Date: May 2002
Location: Los Angeles, California
Posts: 662
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Here is some info. if you want to up grade to an internal regulator alternator.
http://www.chevelles.com/techref/tecref14.html http://www.madelectrical.com/electri...elcoremy.shtml |
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10-11-2005, 07:28 AM
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#9 | |
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Registered User
Join Date: Aug 2001
Location: SOMERSET KY.
Posts: 6,427
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Quote:
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junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE.  THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES//LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST |
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10-11-2005, 08:53 AM
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#10 |
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Registered User
Join Date: Sep 2001
Location: Cumming, GA
Posts: 466
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Here's an article about 1 vs 3 wire. Based on this article I went with a 3.
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10-11-2005, 08:57 AM
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#11 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,535
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Hmmm, can't see the article?
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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10-11-2005, 10:34 AM
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#12 | |
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Born a Chevy Man
Join Date: Apr 2005
Location: Navarre, Florida
Posts: 10,221
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Quote:
Nope, not there.
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John or 86 (Viet Nam combat Vet-BIG RED ONE) '65-'66 *1986 Chevy SWB Silverado *1984 Chevy Longbed Silverado New Kia Sportage (Wife's car and she loves it)  CHEVY, American made w/pride!  If you can read this, YOU NEED TO THANK A TEACHER! If you can read this in ENGLISH, PLEASE THANK A SOLDIER!  GOD BLESS AMERICA AND BLESS OUR FIGHTING TROOPS |
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10-11-2005, 11:23 AM
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#13 |
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Black 72 Chevy
Join Date: May 2002
Location: Los Angeles, California
Posts: 662
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http://www.madelectrical.com/electri...hreewire.shtml
Here is some info. comparing 1 wire to 3 wire alternator. |
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