Question about 1984 Ford F 250

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Batteries not charging in 83 Ford 6.9L diesel.

New alternator is putting out 11.9 peak. I can feel the regulator and see on meter that it is kicking in and out. Is it possible that there is too much resistance through the regulator? Could something else be drawing a heavy load while running? Thanks for the help in advance.

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Your alternator should be putting out 13 to 14 volts when all your lights are on and radio and so forth. If it is only putting out 11.9 peak your alternator is putting out less then a fully charged battery. The alternator is shot or regulator.

Posted on Jul 28, 2009

  • outdoorsman5
    outdoorsman5 Jul 29, 2009

    If you want to fool your alternator pull the positive lead off of the battery and test with ohm meter set to DC Volts. If the alternator goes up to 13 to 14 volts your alternator is working fine. Basically when you pull the positive battery lead off you are acting like the battery is bone dead. If you car amp if you have one is cranked up your alternator should be putting at maximum charge. Belts could be possible but generally if it is a belt issue your volt gauge or ohm meter with be surging as well because the belts are slipping on the alternator pulley. Still when you see this on a meter you should still see it surge up to 13 to 14 volts unless your battery is fully charged.

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What is the temperature gauge doing?
Does it get to about half way, or does it barely get off cold?
If it stays fairly cold, then it is probably the thermostat jammed open and needs replacing.
The glow rail controller senses engine temperature to turn off the glow rail (about 50C).
If the glow rail stays on + short trips + winter driving with lights, defrost, heater on, lower air temperature, then the alternator cannot keep up with the glow rail staying on.

Posted on Oct 26, 2009

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Do you have a big amp for your music? These do draw a lot of amps. If you see your meter kicking in/out you may have a short. Try to disconect any other devices. Start by take the battery loose, ck the Alt. output with the battery out of the circuit. Then ck your hitch wiring if any. I would not suspect your reg. yet. If you have an after market radio disconect that and retry. 

Posted on Jul 28, 2009

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Yes

It absolutely can be something else and I'd start with checking the tension and condition of your belts and the electronic grounds to all components as my absolute first checks.

See 11.9 is a little low and to get amperage up could very well be belt tension or faulty ground or a little of both.

Posted on Jul 28, 2009

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