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Sudden loss of Electrical power (except emergency flashers)

Tiny
CBURNETTE49
  • MEMBER
  • 1976 DODGE
  • V8
  • 2WD
  • MANUAL
  • 146,898 MILES
Was driving truck when suddenly everything died: Lights, motor, all accessories (except emergency flashers) Battery is charged and takes a load. The "idiot lights don't even come on in dash. When I check from battery ground to Battery terminal of alternator I have nothing, when I switch test light to positive side test light lights up. Is Alternator somehow interrupting power flow to entire truck cab or ignition switch not distributing power?
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Wednesday, August 10th, 2011 AT 2:40 AM

7 Replies

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
LOOSEN, CLEAN, "SCOOCH" CONNECTORS AROUND, TIGHTEN WELL. EVERYTHING THAT IS A CONNECTION ON YOUR BIG CABLES (EVEN THE "CABLE SQUEEZERS" ON THE BATTERY CLAMPS!), POS AND NEGATIVE. ANY ITEM THEY CONNECT TO AND LEAVE OUT OF. ALL THE WAY TO THE STARTER. AND ENGINE GROUND. CHECK ENGINE TO FRAME GROUND AS WELL AS BODY GROUND!

LOOK FOR BAD FUSIBLE LINKS, TOO!

AS YOU PROGRESS. SEE IF IT'S FIXED, SO YOU WILL KNOW--"WHAT THE EVIL DEMON WAS!"

NO GETTING LAZY AND EXCLAIMING, "THAT LOOKS GOOD, I'LL SKIP IT!"

I'M HERE ANOTHER HOUR OR SO. ANY QUESTIONS?

THE MEDIC
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Wednesday, August 10th, 2011 AT 3:31 AM
Tiny
CBURNETTE49
  • MEMBER
  • 4 POSTS
It appears it is reversed for me I have ground but no power past main cables, somewhere main feed to everything but emergency flashers works. I looked up no light in dash when key on and Bad alternator was a suggestion I just cant figure out how an alt can affect whole power loop into cab. Baffled in VA, I have started running continuity checks across board trying to verify no breaks before swapping alt, volt reg, key switch etc. Will follow up when sun comes back up thanks for info and your time.
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Wednesday, August 10th, 2011 AT 5:32 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
'76?

I DON'T SEE THE ALT AS A FACTOR EITHER!

UNDERSTAND AND KNOW HOW TO CHECK FUSIBLE LINKS?

DOWN HERE IN S.C.

BED TIME WAS 2 HOURS AGO!

SEE YOU LATER TODAY!

THE MEDIC
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Wednesday, August 10th, 2011 AT 5:54 AM
Tiny
CBURNETTE49
  • MEMBER
  • 4 POSTS
Found damaged batt cable grounded out to starter, but after changing cable and cranking motor it ran momentarily and died again. I have also determined that Batt term wire to alt is showing continuity to ground. Starting to think that short coulda burned fusible link somewhere and I have just not found the intermittent little demon. And am not fully convinced the ket switch isn't faulty. Thanks for your time with earlier posts and any future tips you my provide.
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Thursday, August 11th, 2011 AT 3:58 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
TO BE REALLY LAZY, ON MY END (I REALLY HUNT AND P.ECK SLOW!)---READ AND SEE MY HOMEMADE PICS AND "COUNTRY BOY" EXPLANATIONS!

https://www.2carpros.com/questions/1992-ford-ranger-wont-start

MAYBE IT WILL HELP

I'M HERE...KEEP ME POSTED...I LIKE AUTO SOAP OPERAS!

THE MEDIC
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Thursday, August 11th, 2011 AT 4:08 AM
Tiny
CBURNETTE49
  • MEMBER
  • 4 POSTS
Kept checking wiring and finally found the culprit, when batt cable arced off it damaged a small remote body ground located under a rubber flap covering radiator. Thank you for all your time and effort in replying to my dilemma. Will recommend this site to friends as well.
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Friday, August 19th, 2011 AT 4:54 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
AIRBORNE!

GLAD YOU GOT IT ALL FIGGERED OUT!

YOU SHOULD STILL EXPLORE OUR SITE. BREAKING YOUR RIG, IS NOT A PREREQUISITE!

THE MEDIC
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Friday, August 19th, 2011 AT 7:46 PM

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