89 alternator won't charge
#1
89 alternator won't charge
I have a 1989 F350 diesel, with a voltmeter as opposed to ammeter or indicator light. Alternator is not putting out. Alt is new and tests good. Regulator is new heavy duty Napa unit.
I can't find the correct diagram for the volt meter application. All fuseable links are good and all wires checked good with ohm meter. Any body run across this? A good schematic would sure help.
I can't find the correct diagram for the volt meter application. All fuseable links are good and all wires checked good with ohm meter. Any body run across this? A good schematic would sure help.
#2
My understanding is regardless if you have a voltmeter there is still a Charge/Battery indicator in the instrument cluster..perhaps I am wrong. I am certain Ford uses the same Light Green/Red wire to turn the alternator "On". There should be power on this wire when the key is in the Run position. if it is missing, there is your culprit.
This basic diagram may help.
This basic diagram may help.
#4
#5
Is there power on the Light Green/red wire with the key in the On position? If not, there is your root cause. You need to chase that back into the cab, instrument cluster, ignition switch.
#7
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#8
89 Alternator won't charge
Thanks to all who replied. I learned the hard way that you cannot use an LED bulb in the ALT light circuit. I had some thru voltage but not enough to excite the relay. I replaced it with an incandescent bulb and now have normal voltage at the green/red wire and an operating alternator.
#9
Thanks to all who replied. I learned the hard way that you cannot use an LED bulb in the ALT light circuit. I had some thru voltage but not enough to excite the relay. I replaced it with an incandescent bulb and now have normal voltage at the green/red wire and an operating alternator.
Thanks for posting your success and hope to see you soon!
#10
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