2001kw starting prouble

i smell a bad battery, ies check every one of them

 

Probably already have it figured out by now. If you still need help and have a dvom (digital volt ohm meter) post again and I can help.

 

probably the relay on the fire wall getting tired, easy to replace.

 

Entire battery stack is going to be bad. Root cause is probably alternator or a deep short somewhere that is a parasite on your voltage.

Those slow shorts leave you with like... 10 volts when you turn the key ready to crank the engine but sit there for a moment, let the computer sweep the gauges and ergo! 10 volts maybe a skosh over 9 volts instead of the expected 13 something or 12 something volts. I get worried when the voltage gauge does not show at least 12.5 volts because you are going to get a little bit of crank before you kill the batteries, and the closer you drift or fall lower to 9 volts required to keep a computer booted and running without itself bricking the whole experience of trying to start a drying truck becomes a running sore that really is going to make a mess on your day. 4 batteries to check, cabling and ternimals to check on each of them. Trace em to the starter motor, check each one. Then follow the harness elsewhere usually the fuse box to hunt shorted something if you did not already see a code thrown after a failed gauge pre-start sweep. (Diagnostic prior to start up...)

It then becomes a exercise in which you need a volt meter somewhere it can see overall the ohms in resistance waiting literally for it to remain in ohms resistance after you pull the right subsystem fuse that is containing the parasite short that is draining your rig electrically. Or it could be something as simple as rolling through the salt treatment in winter that got under your battery cover and generated a path between batteries to short quietly until it evaporated away in a few hours time. OR any number of problems including trailer systems that might be compromise and the whole thing is a parasite on the tractor.

Lovely.

Im a go away now and get a nice stiff drink. It hurts my head to type all that out knowing some of you are gonna go HUH? Then I have to dig up you tube videos to show you in pretty pictures how to follow up a parasite short.