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Q: charging problem on 1990 Dodge Ramcharger

Asset 21
i've replaced the alternator and battery, can't hold a charge. trying to figure out if its a fuseable link, what do you think?
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What is the alternator output? Need to know the voltage and the max amperage output. Will also need to know the results of a load test on the charging system.
do i need to hook some kind of meter to the alternator to get the output and max ampage, and voltage info?
what did you figure out? I am stumped with mine cant figure out why I am not getting a charge when my battery and alternator test just fine. I am really tired of trying to figure this out.
I am Getting 120 amps of voltage from alternator. But I am also getting Ignition feed through bolth field untill i disconnecet the altnator. then the computor sends a ground. I can ground the altanator manuley to charge but the truck wont do it itself
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