1994 8 cylinder van is overcharging. Could it be a fuse?
Usually, if a vehicle is overcharging, it is usually an issue between the battery and the alternator. I suggest having the alternator tested first. Also, check to ensure the battery terminals are clean and secure, as well as on the starter (positive) and the chassi or engine block (ground). Also ensure that the wiring harness plugged in to the alternator is clean and securely plugged in as well. Unplug it and inspect the inside - there may be a "residue" which his a protective grease put on during manufacturing of the vehicle, to help prevent wear from weather, and use. If all these connections are good, then proceed to have the alternator and even the battery tested for proper charging. And yes, it would be a good ideas to check all fuses related to the battery, ignition, and start: these would include, the starter relay (under hood, near battery in black fuse/relay box),. starter/ignition fuse, in fuse box under dash, or in glove compartment (in some vehicles), as well as any ACC fuses in the fuse box, if installed.
Please let me know if you need further assistance.
carsandcomps,
Guru, Premium Expert, Phone Suppport, (Chat) @ Fixya.com
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