Bj40 charging diagnosis? (1 Viewer)

[landcruiser78]

Hello everyone ive tried looking online and all my books dont show anything for 24v. (Its a 1978 bj40)
With engine running, anything electical on, my amp meter is over on the negative side. I am not familiar with this charging system and wondering if anyone has a wiring diagram for it or can explain what the first things to check for involving diagnosing it. Batteries are only 2yrs old.

Im taking it out tomorrow for a pleasure cruise and hoping i can have this figured out before hand

Any help would truly be appreciated! Cheers

 

[jblueridge]

I can't help much but I also have 24V vehicle.

I would disconnect battery clamps and clean all of them.
I would look at the alternator electrical terminals and connections: clean them too.
Also investigate ground wire connections.

If you have a multi-meter you could run engine and check voltage between alternator + terminal and ground.
Should be greater than 24V.

 

[Mr Cimarron]

Is it happening at idle or all the time? Mine will show low voltage at idle with lights on but goes back to normal once I start moving.

 

[roscoFJ73]

With engine running, anything electrical on, my amp meter is over on the negative side

I think the BJ40 24v has a 30 amp alternator, so its not making much to start with.
As the others have said, clean up the wiring including the earths at the engine and/or chassis.
Check the fan belt that turns the alternator
Next step will be to get the output of the alternator checked if you cant do it yourself.

 

[fenwaykid]

I have had a similar issue. The output is extremely low and there is a draw on the battery when the lights are turned on. How is your voltage regulator looking?

I can't offer much help. I've sent mine to a shop after having someone look at the alternator.