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#1 |
Registered User
![]() Join Date: Sep 2010
Location: Sullivan County, NY
Posts: 455
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Need advice on electrical problem
The last couple of times I pulled my truck into the garage, I noticed that the headlights and dash lighting was dimming and brightening right in unison with the engine speed. At an idle, they get very dim. Does this sound like a voltage regulator problem or a bad alternator?
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#2 |
Registered User
Join Date: Aug 2009
Location: St. Paul MN.
Posts: 1,996
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Re: Need advice on electrical problem
how is the belt tension?
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#3 |
Registered User
Join Date: Apr 2013
Location: Austin Texas
Posts: 111
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Re: Need advice on electrical problem
Check grounds especially the engine, alternator (if equipped) and of course negative battery termination to frame. I'd pull them and clean them all and make sure they are on bare metal. Belt could be suspect as well as mentioned above.
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Owner: Times Are Tough Toys 92 4 Runner (Joyce, long story from my time in Africa) Lotsa stuff, just about finished dumping money into it. 89 Mercedes 560 SEL, Merdle. Wrecked 71 Chevy K20, Clifford, BB and 1 Tons |
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#4 |
Registered User
![]() Join Date: Sep 2010
Location: Sullivan County, NY
Posts: 455
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Re: Need advice on electrical problem
I'll check these out today and see if it helps. I'll be very happy if it's something inexpensive like this.
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#5 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Need advice on electrical problem
cleaning up all electrical connections and having nice clean shiny metal on metal conact aided by a bit of dielectric grease is a great help for the lights workin right
but the fact is that the lights will dim at lo RPMS cause that is the way they worked 40 to 50 years ago thay are not like 2013 stuff
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#6 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,217
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Re: Need advice on electrical problem
Put a load test on the battery. Sounds like a battery getting weak.
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#7 |
Registered User
![]() Join Date: Sep 2010
Location: Sullivan County, NY
Posts: 455
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Re: Need advice on electrical problem
OK guys, once again, great advice! I replaced both fan belts and cleaned the ground to the engine block. There was paint at the ground site, so I ground it bare. Problem solved for under $20!
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