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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

lights pulsating

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Old Jan 24, 2012 | 06:24 AM
  #1  
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4601ton
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From: Montgomery, AL
lights pulsating

I think my original alternator might be giving up the ghost. I noticed today when I pulled up to work my lights seemed to be pulsating ever so slightly. The gauge doesn't seem to be pulsing with the lights. Tried turning off blower motor, no change. Tried turning on blower motor full blast, lights dim and pick back up again...ideas?
 
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Old Jan 24, 2012 | 07:01 AM
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Check that your battery terminals are clean and tight, check that ALL ground wires are clean and tight where they bolt up.
 
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Old Jan 24, 2012 | 07:20 AM
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Alright, will do! Probably is grounds, I know I have one that is questionable, and they're all original.
 
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Old Jan 24, 2012 | 07:40 AM
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also pull the wires off the headlight switch and inspect it closely. these trucks are known for burning the light switch and wiring pigtail.
 
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Old Jan 24, 2012 | 07:59 AM
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If you give it a little gas does it even out?
 
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Old Jan 24, 2012 | 11:08 AM
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Originally Posted by tjc transport
also pull the wires off the headlight switch and inspect it closely. these trucks are known for burning the light switch and wiring pigtail.
THIS!













... and more letters for the forum software..
 
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Old Jan 24, 2012 | 11:21 AM
  #7  
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i had a core support ground boogerd up from previous owner, when you turned on the headlights it would shut the truck off
 
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Old Jan 24, 2012 | 12:20 PM
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4601ton
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From: Montgomery, AL
I didn't even rev it up, honestly...I'll try that after work. And I'll check the headlight switch...it, too, is original...

Thanks for helping me keep Daisy healthy guys!!
 
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