[530farmboy]

john deere 4840 charging system isnt working. The alternator is in good shape charging at about 14.5 volts but the charge is not making it to the battery i cant figure out why its not doing what it should. could the system be drawing power somewhere. thanks in advance

 

[powerstroke742008]

might need a new battery same thing happened to our ford 9000

 

[530farmboy]

i have put about 3 batteries in it in the past couple months trying to find the problem

 

[Fordfreak4life]

unhook the ground cable on both batteries, hook a multimeter between the ground cable on on battery and the negative post, set the multimeter over to ammeter and if you have a reading over .003 or 3 millivolts then you have a problem, make sure the key is off when u do this

 

[530farmboy]

thanks guys

 

[Fordfreak4life]

if u need any other help pm me, i work at a john deere dealer here n kansas, i can get any info you need

 

[530farmboy]

thanks

 

[fordtrucksrule7]

we had a similar problem with our 4840 while chopping corn the battery went dead. ours happened to be one of the wires in the 2 wire plug wore through the insulation and grounded out. taped it up and was good to go

 

[530farmboy]

thats what i thought it was also but then i checked it out it was fine. Im almost positive it is the regulator in the alternator itself so im going to change it to a single wire and do away with having a regulator. how does the a/c work in your 4840 fordfreak4life?

 

[530farmboy]

im sorry i meant fordtrucksrule7 not fordfreak4life.

 

[Fordfreak4life]

has yours been converted to R134A? either way it should have no problem freezing you out of the cab, if it wont i would suggest blowing out your condensor and evaporator

 

[fordtrucksrule7]

the ac in our 4840 works good, it just got a new compressor last year after it locked up. after it gets cool inside it hardly gets off the slowest fan settng. and it was converted to 134