Posted by Steve@Advance on November 21, 2018 at 11:30:19 from (66.169.147.211):
In Reply to: Battery going down posted by flying belgian on November 21, 2018 at 06:23:29:
Sounds like it is not charging.
Each time you charge the battery or replaced the battery, it resulted in a temporary fix until the battery ran down again.
The tach problem could be related. Depending on how the alternator is wired, the tach may be on the circuit that provides the excite voltage to start the alternator charging.
Check all the fuses, look for obvious wiring problems like mouse chewed wiring, unplugged connectors, burned or pinched wires. Check the alternator belt to be sure it is tight and not glazed or worn down to the bottom of the pulley.
If you have a volt meter, check the battery voltage with the engine at 1/2 throttle or more. Should get about 14-15 volts. If down around 12v it is not charging.
You can take the alternator to about any auto supply and have it tested. If it tests good there is a wiring problem.
Without knowing the brand and model number of the alternator, can't tell you what to check other than the large battery post should have battery voltage at all times.
If you are not comfortable trouble shooting this, a starter/alternator shop could repair it, probably much less than a trip to the dealer.
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