79 F150 charging problem
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79 F150 charging problem
Hey All,
My 79 f-150 plow truck won't charge? I just had the altinator checked at auto zone and they say it's OK. I replaced the voltage reg and just metered out all wires/fusable links coming from the altinator they checked OK. I'm at a loss can anyone suggest a fix or what to check next?
Thanks,
Ken
My 79 f-150 plow truck won't charge? I just had the altinator checked at auto zone and they say it's OK. I replaced the voltage reg and just metered out all wires/fusable links coming from the altinator they checked OK. I'm at a loss can anyone suggest a fix or what to check next?
Thanks,
Ken
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From: Virginia
I know you checked the fusible links, but just to make sure, check to see if you have battery voltage on the large bat terminal in back of the alt with the engine off.
Make sure you have bat voltage on the yellow "A" wire going to the reg with the engine off.
With the key in run, engine off, make sure you have some sort of voltage on the "i" terminal of the reg(I believe you will since you said the dash light is burning)
Finally, with the truck running, see how much voltage you have on the "f" terminal of the reg, and write back in with that.
P.S. I just thought of something that needs to be checked. Make sure the reg case is grounded properly. The best way to do this is run a wire under one of the mounting bolts, and hook the other end to the engine block or the battery negative.
Make sure you have bat voltage on the yellow "A" wire going to the reg with the engine off.
With the key in run, engine off, make sure you have some sort of voltage on the "i" terminal of the reg(I believe you will since you said the dash light is burning)
Finally, with the truck running, see how much voltage you have on the "f" terminal of the reg, and write back in with that.
P.S. I just thought of something that needs to be checked. Make sure the reg case is grounded properly. The best way to do this is run a wire under one of the mounting bolts, and hook the other end to the engine block or the battery negative.
Last edited by Franklin2; Oct 14, 2007 at 01:28 PM.
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OK, CHECKED A has bat voltage, I has battery voltage with key on, F has nothing running? Ran new grounds from reg,started sol to battery ground. Tryed new alternator for kicks and still no charging? The alt light is on soild no flickering. I'm lost someone have any idea what is going on here?
Thanks,
Ken
Thanks,
Ken
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OK, That got me charging BUT the voltage kept climbing was up to 16.5 before I shut it down. What's next?
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Replaced Regulator and still not charging? This is not looking good. I don't get it. I replaced everything but wireing and all that tested and looks good. No corrosion or splices, fusable links OK. Anybody else know what is going on? Does the ingnition switch have anything to do with this? I'm going to change it next just to make sure.
Thanks all,
Ken
Thanks all,
Ken
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Joined: Aug 2005
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From: Easton,Ks
Sounds like the Regulator does not have a common ground from the alternator and battery, all three must share a good ground to each other.
As far as the ignition switch goes if you have voltage on the "I" connection of the Regulator with the key in the on (RUN) position then the ignition switch is doing its job.
If you do not have power at the "I" connection of the Regulator then that is your problem.
This diagram is for a car but your system should be close.
/
As far as the ignition switch goes if you have voltage on the "I" connection of the Regulator with the key in the on (RUN) position then the ignition switch is doing its job.
If you do not have power at the "I" connection of the Regulator then that is your problem.
This diagram is for a car but your system should be close.
/
Last edited by subford; Oct 26, 2007 at 10:52 AM.
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From: Virginia
I agree, possibly your "I" wire is grounded somewhere? That would make the light in the dash burn all the time, and it would not charge. Everything else seems to be ok. Check for voltage on the "I" with the key in run with the engine off, and then with it running.