PLEASE HELP!!! Do I need to replace batteries

OK get the batteries properly checked, the load testing is one method but I like the computer testing of batteries, which is better.

IF you need to replace one, replace ALL.

Second is that when you took the power away from the ECM, and then applied it then tried to start it, you may have erased the operating behavior parameters that are set up by driving the truck. The ECM has a learning curve that it needs to do when there is no power for a while. So it may take a bit to get back to normal.

 

We usually drop in new batteries prior to start of winter.,

Just had one put in on our tahoe after the liquid level fell enough for the plates to literally silt up in minierals then fail.

One of these days Im fixing to install a second battery with a kill on it. It has one job only and that is to light off the engine so we can get home.

 

Get 'em load tested individually. A good 400-550 amp draw (1/2 CCA rating) on each battery will tell you pretty quickly if you've got a failed battery.

 

.

Your truck has about 130amp alternator and maybe 4 batteries at 800 amps each it will take 8 hours per battery so maybe 24 driving probably 2-3 days to recharge them or longer because the truck is using lots of the power just running I bet it will take 4-5 days to recharge the batteries.

 

Is there a specific way to remove a dead battery? Meaning..I heard when a battery is dead it can be more explosive when trying to take out???

 

Yes, hydrogen gas is very explosive and batteries that have had a heavy draw on them or a rapid recharge give off more gas. If you can smell rotten eggs, just open the battery box lid and let it vent. Once its done and you can't smell it, fan the area with a clipboard or a piece of cardboard to help remove any residual gas that may be lingering.

Always remove all the grounds from the battery group first and install them last. This will significantly reduce the risk of an explosion. Definitely protect the eyes and face. I always wear safety glasses in the shop but typically add in a faceshield and nitrile gloves when dealing with batteries, especially gassy ones.

 

Thanks for info...very helpful!! I'll have to be sure to remember all that!

 

What does it mean when the red wires have this oozing stuff coming out of them?