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#1
03-14-2010, 05:35 AM
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Ford Excursion help
I recently got a 2000 Ford excursion (Diesel) And the battery light comes on all of a sudden when the truck is running. It turns off if you give the engine some RPM's but if you let it back to idle then the light will come on. I've worked with 7.3's before, but nothing this computerized before... any suggestions?
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hum..... 1987 300TD 311,000M Stolen. Presumed destroyed 
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#2
03-14-2010, 08:04 AM
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Put a volt meter across the battery and idle the engine. It sounds like a failing voltage regulator or alternator to me...
The idle voltage should be around 14VDC
__________________
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
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#3
03-14-2010, 08:19 AM
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I'm going to guess you don't have the dual alternator setup.
Take it to a battery shop and disconnect both batteries and test them one by one. If they test out good, check the charging system. Unless you have a dual alternator setup (probably not), I am going to suggest you take out the alternator and have it tested. When you untension the belt, spin the alternator. It should be on the top left part of the engine. If it drags at all or makes noise, get a new one. If it is fine, take it out for testing to make sure it does give the current you need. Since you can glow and start it, I am leaning more towards charging system.
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01 Ford Excursion Powerstroke 99 E300 Turbodiesel 91 Vette with 383 motor 05 Polaris Sportsman 800 EFI 06 Polaris Sportsman 500 EFI 03 SeaDoo GTX SC Red 03 SeaDoo GTX SC Yellow 04 Tailgator 21 ft Toy Hauler 11 Harley Davidson 883 SuperLow
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#4
03-14-2010, 10:06 AM
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First thing , the plug on the top of the Alt has a bad habit of becoming loose check that first. Have someone watch the light while you wiggle the plug. Second the brushes could be shot. The voltage regultor is on the back of the ALT. You can buy the brushes and the voltage reg at Autozone. Very simple repair. DO NOT buy a new Alt yet.
Last edited by daveuz; 03-14-2010 at 10:57 AM.
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#5
03-14-2010, 11:54 AM
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could also have a bad diode.but if it's like the fords of years ago you have to replace all of them.and those diode bridges will cost about as much as a rebuilt alt.years ago you could buy all the diodes separate.positives and negatives and just replace the bad one.then somebody got the brilliant idea to combine em.so now you replace all of em when it's just one that usually causes the problem.this pisses me off.just recently i had to replace the alt in my suburban.it acted like a bad regulator.so i went to get one at the parts house.turns out they are not "servicible". turns out they solder the leads from the winding thru the back case.so in effect you can't pull the alt apart.i kept the core and i'm gonna break those solder joints and see if in fact the reg can be changed.
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#6
03-15-2010, 03:20 AM
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it was the brushes. Replaced them.
__________________
hum..... 1987 300TD 311,000M Stolen. Presumed destroyed
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#7
03-15-2010, 06:30 AM
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Isn't it great when a potentially expensive problem can be fixed for cheap on a modern vehicle!
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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250
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