charging circuit fuse is blowing

ken o · 10-20-2009, 07:56 AM

Hello --

I have a 1986 4x4 truck -- 22R engine, 5 spd trans, no A/C, 307,000 miles. Lately it blows the 15 amp fuse marked "ENG" in the under-dash fuse box. I lose the charging circuit ("Charging" light goes on and volt meter shows about 12 volts when running) and the turn signals. If I replace the fuse, even temporarily with a 20 amp fuse, it blows again right away. Could this be an alternator or voltage regulator failure or what? Thanks.

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brian2sun · 11-02-2009, 10:58 PM

You could test your alternator and see what kind of voltage it's putting out, but it sounds like you have a short somewhere.

22RUCRAZY · 11-02-2009, 11:29 PM

Check and make sure that your grounds are gronded , and check everywhere for cut frayed or lose wires

GOOD LUCK

ken o · 11-03-2009, 07:15 AM

It did turn out to be a short in the backup light switch. The backup lights and about 5 other circuits are on this same fuse. Thanks.

11-02-2009, 10:58 PM	#2 (permalink)
brian2sun Registered User Join Date: May 2009 Location: The Mtns, CA Posts: 506	You could test your alternator and see what kind of voltage it's putting out, but it sounds like you have a short somewhere. __________________ 97 4Runner SR5 3.4L 4x4 305/70R16 Mastercraft M/Ts on black stock 6 spokes 2.5" suspension lift ARB Bullbar ARB rear locker 4.88s Factory wood grain dash My 4th Toyota truck "If guns kill people, then pens write novels."

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11-02-2009, 11:29 PM	#3 (permalink)
22RUCRAZY Registered User Join Date: Sep 2009 Location: northern california Posts: 118	Check and make sure that your grounds are gronded , and check everywhere for cut frayed or lose wires GOOD LUCK

11-03-2009, 07:15 AM	#4 (permalink)
ken o Registered User Join Date: Oct 2009 Posts: 3	It did turn out to be a short in the backup light switch. The backup lights and about 5 other circuits are on this same fuse. Thanks.