Alternator - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 01-03-2010, 04:04 PM Thread Starter
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My battery light has been bouncing on and off. I thought I had it traced to the wires on top of the alternator being "loose". But now no matter what I do I can't get it to go off. I am pretty sure it's charging fine since it starts fine and the voltage seems good. Ranges between 14.2 to 14.7 while driving and drops to 13v with it turned off. Anyone got any more thoughts? Maybe I need to dig into those wires on the top of the alternator some more.

FYI the set up below was really effective for anyone else out there looking to diagnose such a problem. Do be careful not to buy an adapter that has any kind of regulator in it. I almost did and it would have ruined my test.


Link to Radioshack
Enercell™ Vehicle Adapter Plug w/ Banana Jacks -

Here it's connected to the leads on my multimeter


'97 F250 7.3l
SC LB 4x4
280,000 miles

Last edited by blindlightguy; 01-03-2010 at 04:10 PM.
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post #2 of 2 Old 01-03-2010, 04:22 PM
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Hmmm i dont know what to tell ya. How long ago were your batteries changed?


'09 F-250 Lariat Crewcab Longbed
6.4 PSD
Spartan tuned
DPF deleted
Industrial Injection twins

EGR to be deleted once I get the blowoff valve installed and lots of other upgrades to come.


97 Ford F250 HD Supercab XLT Longbed
AFE Stage 2 Intake
3" dp
Bully Dog exhaust
Hypertech programmer-getting 6 pos chip soon
Hankook all-terrains on Mickey Thompson classic II
Autometer: Pyro, Trans, Boost guages in A-pillar
Beans IDM Mod
Dana 60 swap
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