PLEASE HELP!!! Do I need to replace batteries

Well,it takes AWHILE to charge up them 4 Dead batteries,this has been my experience 20 minutes isnt unheard of.13.7 to 14.1 is normal also.With battery cable tightened up? I would suspect your Starter/solenoid needs replaced.Have someone tap on the starter case (while you start it) see if it still drags.Its a 2016? Do you turn it on and off multiple times everyday?

 

How long ago did you run the batteries dead? If it was only an hour or so then they may not be fully charged yet which will give you slow cranking. Your voltage is fine, so your alternator is working.

Check the loose cable, if they didn't fix that you will have cranking issues as well. If neither of the above applies then you may have damaged at least one battery by deeply discharging them. Typical truck batteries are simple starting batteries and not designed to be fully discharged. If this is the case you can have each battery tested, it is a simple procedure but can be time consuming to do correctly. Each battery will need to be charged and tested individually. Now, if you find one bad it is a best practice to replace all batteries at the same time, usually if one is bad the others have been strained trying to keep up, plus the battery bank works better when they are of similar age and condition.

 

You say its a 2016? Not really a lot of off on cycles for a starters life,but who knows.Just have to do the old process of elimination.Get the batteries load tested,check wiring to starter and solenoid etc.Good luck to you.

 

Unhook all your batteries and test each of them individually. You may have one that has a dead cell now which will cause start voltage issues and pull down the pack when sitting.

The bad battery will show a significant lower voltage than the others ... 3 to 4 volts different usually

 

4 dead batteries it's a drain on them. Your numbers are ok, for maintaining a computer network on your truck. But they will never be the same.

I will work on replacing the 4. You have winter coming and that already by itself induces additional stresses against your batteries.

If you are in a position to get a APU truck that has one job, feed batteries, keep engin eblock warm, and circulate main fuel returns etc As well as provide hotel support to humans, air and heating. You really need to bite the bullet and get one.

 

Get a voltmeter , test all 4 and post the results.

 

one bad battery can pull the others down. if the batteries are more than 4 yrs old it would be a good idea to replace them all. If they aren't marked it is poor maintenance practice and i would probly replace. Could be your connections check for white corrosive powder clean w/ wire brush . severe use on batteries in a modern truck, relatively cheap to replace batteries , much less than roar service.