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Hello,
I would be very concered that the fan kicking on did this. Suggest you disable the fan until you can sort it out. Does you fan have an inline fuse first of all? If not may I suggest you add one, that will prevent damage to other componets if the motor does start shorting out.
Easy things first, check the connectors to the battery, starter, and alternator for corrosion of the contacts and the wires up in the crimps for tarnish and green copper corrosion. Suggest replacing any that you can not shine up.
Check the ground wire from the block to the alternator, you have to get a good ground path on the alterator housing. You should have less than .2 ohms using a decent meter from the housing to the engine block. If you do replace it, size matters here. Use at least a 14 guage wire from the ground connection.
Go to an auto parts store that has a newer diagnostic testers. Advanced and Auto Zone both have systems that are pretty good. Someone who understands how the unit works is a big help, I have seen a couple of kids out in the parking lots that have trouble finding the battery. The test can vary the load on the system to check the voltage output, monitor for excess ripple (points to a bad diode)and measure the current output of the charging system. Now this is not the end all for system trouble shooting. But it will give you a place to start.
Regards,
Paul
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