You can replace them all if you want but it’s not generally neccessary.
I’d recommened taking the batteries out and set them on a bench or a piece of plywood on the floor. Test each one individually with a load tester. They will tell you if it is bad or just needs charge. If bad replace if needs charge just charge it. May take overnight. The bad battery will draw down the good ones but once you get rid of the bad one the others generally are gonna be fine once charged.
Whats a good voltmeter to get?
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by nikmirbre, Jul 3, 2020.
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Im headed to the truck now..... fingers crossed.
062 Thanks this. -
062 Thanks this.
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tommymonza Thanks this.
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This is with truck running Everything off, lights radio etc
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This is when I turn on lights radio etc
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Alts not charging. Check output at back of alt and at batts. Should be very close. Alt should be putting out at least around 13.5 volts no more than 14. Batts should be gettin at least 13.5 to stay in good shape.
When you shut down engine and have key off does amp gauge go back to zero? It should if it is working. Volt gauge should show what batts are sitting at with engine off. Some trucks read hot with no key some need key to be on acc.
What does volts show engine off? -
Also. With engine running. When you turn on 4 ways does the needle pulse negative and volts drop with the flasher?
tommymonza and nikmirbre Thank this. -
It’s the alternator... I batteries were fine. I purchased a load tester. Alternator is not charging. So I came to place my stepson works at to verify. Now to find the 210 amp alternator I need on a holiday weekend.....
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