BATTERY OR ALTERNATOR?

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[Poll] BATTERY OR ALTERNATOR? BATTERY   14% (1) ALTERNATOR   85% (6) Total Votes : 7 (last vote on : 9/18/2006 2:24:43 AM) (Poll will run till: -- ) Login Message << Older Topic   Newer Topic >>

BATTERY OR ALTERNATOR? - 5/25/2005 2:45:18 AM    SW_601   Posts: 2 Score: 0 Joined: 5/25/2005 Status: offline 2001 F-250 7.3L DIESEL - BATTERY OR ALTERNATOR? When my battery warning light came on, I figured it was time to get new batteries. I drove the truck for one or two days. Then when I tried to start it the next morning nothing...Dead battery, warning light lit & battery gauge reading low. I bought two new replacement batteries & installed them. The battery warning light still remains lit, but the battery gauge reads normal. I am able to start, drive, use the headlights & normal features of the electrical system. When the truck RPM pings above 2000, the warning light goes out. From what I understand an alternator does not increase voltage as the RPMs increase, so I should notice no difference. I checked the serpentine belt, it appears to be snug & in good shape. Any suggestions before I visit the repair shop? Post #: 1

RE: BATTERY OR ALTERNATOR? - 5/27/2005 12:23:04 AM    truckpuller Posts: 61 Score: 0 Joined: 2/26/2005 Status: offline Alternator probly has a bad or weak diode in it which will cause the light to come on. (in reply to SW_601) Post #: 2

RE: BATTERY OR ALTERNATOR? - 5/27/2005 11:26:10 AM    hockeyhitman69   Posts: 298 Score: 0 Joined: 5/27/2005 Status: offline start with this you should have 12 volts at the altenator larger red battery wire and you should have 12 volts on one of the other wire in the connector with the key on if you do not it is in the wiring alot of times the wires corrode off right at the connectors seen a few times on trucks but much more common on focus hope it helpsand if it doesnt also seen when you remove regulator look at the brushes sometimes grooved befond repair. (in reply to truckpuller) Post #: 3

RE: BATTERY OR ALTERNATOR? - 5/27/2005 11:41:29 AM    Patrick Posts: 240 Score: 0 Joined: 3/17/2005 Status: offline go to a corporate shop, they will run a battery tester on it for free, and that will tell you whether it is the battery or alternator (in reply to hockeyhitman69) Post #: 4

RE: BATTERY OR ALTERNATOR? - 5/27/2005 9:34:29 PM    truckpuller Posts: 61 Score: 0 Joined: 2/26/2005 Status: offline Just realized this is a double post Was posted in the general tech section (in reply to Patrick) Post #: 5

RE: BATTERY OR ALTERNATOR? - 5/28/2005 2:20:35 PM    Patrick Posts: 240 Score: 0 Joined: 3/17/2005 Status: offline hmmm..i just saw the yellow icon and clicked it. (in reply to truckpuller) Post #: 6

RE: BATTERY OR ALTERNATOR? - 6/18/2006 4:31:04 PM    khyron6   Posts: 1 Score: 0 Joined: 6/18/2006 Status: offline My 1991 350 van did the same thing, The belt looked good, Thought it was the alt. But the next day the belt came off. (in reply to Patrick) Post #: 7

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