justen920

Will a 100 amp load tester (Harbor Freight) be big enough to test my batteries? Or should I just take it to Autozone and trust them to do it right? I think my batteries are getting worn out.

papaduck

I had 2 batterys that I was shure were good, took to Autozone to have tested while they were out of the vehicle. They said the batterys were bad. Both were holding 12.8 volts before the test and after. A hydrometer test also showed they were fully charged after the Autozone test that puts a load on the batterys.

My point is, I don't believe every thing I am told. Must see for my self. I would trust the Harber Frieght tester over someone else that might not be very well trained to do the testing.

carl48

just check them one at a time

justen920

thanks, will do.

wellmax

expanding on carl48 reply,

do you have to disconnect the battery to test the battery since the two are hooked together?

papaduck

Yes, disconnect the batterys from each other. Take the cables off one post of one battery and then you can test each battery, but I would want to disconnect the ground on both batterys to insure protection of the electrical circuits that are connected to the batterys.

wellmax

Thanks, will do that,
really did not know how to check them with the duel setup.
2005 model 2500 diesel.

quadman20

If you want to a good test charge both till they green out separately then test with load tester separately as well and you will see if one is better then the other.