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Old 04-19-2009, 09:33 PM
Scott1957 Scott1957 is offline
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Exclamation Help with 1998 f-150 , will not charge.

i have a 1998 ford f150 truck, it will not charge the battery alt. is rebuilt had it checked twice battery is good 12.50 oms. Any ideas?
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Old 04-19-2009, 10:44 PM
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Nice to have you here!

If the alternator checks out OK and the battery is strong are you sure you don't have a short somewhere? When the truck is running, have you checked the alt to make sure it's charging the battery? Voltage regulator?
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Old 04-20-2009, 01:52 PM
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Alternator while running should be higher than 12 volts with most vehicles. 13, or more, would be more like it. Check for the output of the alternator while running (even a bit off idle) and see if you need another rebuilt Alt.
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Old 04-20-2009, 02:24 PM
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When the ignition is off, 12 volts at the battery is normal. When the ignition is on but the engine is not running, battery voltage should be 11 - 12 volts. With the engine running, voltage at the battery should be 13.5 - 15.0 volts.
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Old 04-20-2009, 02:59 PM
Club Wagon Club Wagon is offline
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No idea where you get "oms"?

Quote:
Originally Posted by Scott1957 View Post
battery is good 12.50 oms. Any ideas?
KRM02 has got the right idea. My '98 has sat for weeks & the pretty fresh battery still read 12.16 volts. When the key is switched on that dropped to 11.80 volts. Quite obviously charging, after sitting so long & on high idle, it read 14.36 volts.

IMO if you "have a short somewhere" you usually find out about it pretty quickly, especially in the large wires between alternator & battery. Shorts will ultimately pop a fuse/fusible link or smoke the wire until it burns out. More likely is a bad terminal or connection, that produces high resistance. This can fool a voltage regulator, acting like a fully charged battery.
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Old 04-20-2009, 03:29 PM
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As club wagon mentioned it might be a blown fuse.

That was the prob on my Explorer when it was'nt charging. Replaced the fuse & problem solved.

Strangely enough the fuse is listed as "Generator/voltage regulator" on my 97 Explorer. Go figure. Tradition I guess.
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Old 04-20-2009, 03:33 PM
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Quote:
Originally Posted by 87 XLT View Post
As club wagon mentioned it might be a blown fuse.

That was the prob on my Explorer when it was'nt charging. Replaced the fuse & problem solved.

Strangely enough the fuse is listed as "Generator/voltage regulator" on my 97 Explorer. Go figure. Tradition I guess.
Nope, Ford classifies the device as a Generator these days.
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Old 04-20-2009, 03:33 PM
 
 
 
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