24V or 12V? PLEASE Respond (1 Viewer)

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I have a 1979 BJ40 with one battery. The truck also has a dash coil that should turn glowing red when the glow plugs are being heated, it does not, however, the glow plugs do get hot and the engine does start. I have been told that it is not uncommon to see 24V trucks converted to 12V. and the 12V system does not have enough power to heat the dash coil, is this correct? if so, why would anyone do that. My VIN says the my 40 was "born" a 24V, but again it only has one battery.
Could someone PLEASE tell me if they have dealt with this.
Thanks.
 

BreckenridgeCruiser

I break things.
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Pictures help a lot... If someone converted the truck it would be a lot of work... Obvious would be the starter and alternator, but almost every computer, bulb, and relay would also need to be swapped... Not a small job or cheap set of parts.
 
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Could have been converted from 24v to 12v. Not really enough info in your question in my opinion.
Chris, Please tell me what info I could supply? I'd be more that happy to do so. I want this to be done, Big trip planned at the end of November. Thank you for responding. Mike
 
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Pictures help a lot... If someone converted the truck it would be a lot of work... Obvious would be the starter and alternator, but almost every computer, bulb, and relay would also need to be swapped... Not a small job or cheap set of parts.
Pictures help a lot... If someone converted the truck it would be a lot of work... Obvious would be the starter and alternator, but almost every computer, bulb, and relay would also need to be swapped... Not a small job or cheap set of parts.
Just tell me what pictures you need to see , and I will send them. Thanks, Mike
Pictures help a lot... If someone converted the truck it would be a lot of work... Obvious would be the starter and alternator, but almost every computer, bulb, and relay would also need to be swapped... Not a small job or cheap set of parts.
1602863579315.png
 

BreckenridgeCruiser

I break things.
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What is your vin or frame number? (you can pm me that info if you don't want it public)

Also if you can see part numbers on your starter it would help. Have you checked all your plugs to make sure they are good?
 
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There are lots of threads on the glow system and it isn't exactly straight forward.

You will need to do things like trace your wiring, record things like relay part numbers, glow plug part numbers, measure voltages during different states of operation, make a wiring diagram of what you have etc to figure this out. I don't really see that you have a big problem at the moment though if it is working.

Maybe someone bypassed your dash glow controller and installed different plugs? You won't know until you obtain the information.
 

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