battery wiring, missing second battery

[chevylife]

just bought a m1009 a couple months ago it only has one battery in it right now, i checked and everything is still wired for 24 volts just missing a battery, i would like to put the second battery in the bed of the truck and power it through the power strip mounted inside the cab on the right side. what should i hook the new battery up to when i get it, + to +, - to - or in series + to - and - to + and is that all i would need or is there anything else i would have to wire up to it?

 

[rsh4364]

Interesting idea,never thought about that?What if you put both back there?Better weight dist.and opens up space underhood.

 

[dependable]

A couple of lead-acid batteries in passenger compartment? Mostly that is not a good idea for safety reasons unless you have secure, vented battery box, tie downs and good insulation of cables to front.

Under the hood is a good place for batteries, right above starter.

 

[richingalveston]

you would have to move both batteries to the back to get 24V.
Or extend the cable coming from the neg. of the front battery to the pos. of the rear battery. Then hook the neg. of the back battery to the pos. bus bar behind the seat. The negative of the front battery would go to the neg. bus in the engine compartment.

Big mess of wiring. I currently have both my batteries behind the passenger seat because I needed to modify my inner fenders. Works the same as both being under the hood but takes up all of the floor space behind the passenger seat.

not a permanent solution just temp until my fenders are done and I can put the trays back in.

 

[cpf240]

Is this truck even running? If the wiring is still stock, but only one battery, I don't see how it could be started. Once started though, I could see it running...

 

[chevylife]

Is this truck even running? If the wiring is still stock, but only one battery, I don't see how it could be started. Once started though, I could see it running...

Yes truck still runs fine it just starts very slow since its only getting 12v and my glowplugs get like 3 volts cuz the resistor on the fire wall is cutting the 12v in half thats why i wana get another battery so its back to normal, takes like over a min of holfing the manual glowplugs down to get them warm enough to start lol

 

[chevylife]

Since the battery i have in it now is already hooked to the bus.bar both neg and postive cant i just have the battery in the bed ran positive terminal on battery to the neg bus bar in cab and vise versa and it be in series cuz the bus bars are connected already straight to the battery?

 

[richingalveston]

if you are starting the truck with one battery then you must have a 12V starter and not a 24v. They probably converted it but did not remove the resistor. go ahead and bypass the resistor its a good thing for the truck
Batteries must be in series, if you use the back bus without adding another wire, the neg. on the back bus would be 12V+ and the positive would be 24V+. You would not have a Neg. at the rear bus bar anymore.
The negative returning to the front bus must be removed because it is now the 24v+ . You would need another bus bar for the 24+ under the hood.

Also, if you run the truck on one battery and it is still wired for 12V you will ruin alt. 2 which is trying to produce 24V but has no place to put it since there is no 24V battery. There are also back feed issues in some cases when second alt is running without a battery for it.

check your starter and make sure you know which one you have. IF you move the batteries the best thing is to move both of them to keep the wiring easy.

 

[chevylife]

Ill check my starter when im home if.it is a 12v starter what would i need to.change out im gona bypass the resister when im home to.

 

[doghead]

A few detailed pics of your battery cables and connects would help us determine what is going on.

 

[chevylife]

Ill take some pics when im home today

 

[Warthog]

There is a lot more to the CUCV wiring system than just hooking up the batteries in series for 24v.

Something just doesn't sound right with your wiring and one battery. As said pictures will help us help you.

 

[KansasBobcat]

just bought a m1009 a couple months ago it only has one battery in it right now, i checked and everything is still wired for 24 volts just missing a battery, i would like to put the second battery in the bed of the truck and power it through the power strip mounted inside the cab on the right side. what should i hook the new battery up to when i get it, + to +, - to - or in series + to - and - to + and is that all i would need or is there anything else i would have to wire up to it?

What is wrong with original battery locations? Is a battery tray missing? Some have mounted 2 civilian batteries in one tray to have more room under hood. I've had enough batteries leak acid that I do not want them in passenger compartment if possible. Exception is HMMWV where they are well secured under passenger seat which is nonconductive, nonmetallic. Good luck and keep us posted.

 

[chevylife]

Second battery tray is missing along with topa that hold the batterys down have one front tray closest to grill and ithe batterys straped to it and the tray is kinda rusty and sketchy so mabe ill see if its a 12v starter and go from there mabe convert to 12v cuz putting it in the bed sounds like alot of wiring i dont wana deal with right now

 

[chevylife]

There is a lot more to the CUCV wiring system than just hooking up the batteries in series for 24v.

Something just doesn't sound right with your wiring and one battery. As said pictures will help us help you.

i looked at the starter and i believe its a 12v starter its hooked straight to the battery also, glow plug resistor is bypassed now to. i have a dog head starter relay since im getting everything to 12v now should i tie the purple and purple and white wire together and if so what terminal on the doghead relay should the two go to it still works fine as is set up one wire to each post on the relay. and i will get rid of one alternator to only problem is i read that the isolated ground should be on the passenger alternator which on mine its on the driver side theres no isolated ground wire anywhere on the passenger side. so can i just delete the passenger alternator and rewire everything for one alternator?

 

[chevylife]

coverting to 12v whats needed

I have the 12v starter someone else changed out, resistor for glowplugs are bypassed, i have both alternators still wired for 24 what one do i remove can it be the passenger side and how ? And i have a doghead relay do i have to splice the purple and purle and white wires together and if so what terminal on the relay should they be on. Thanks

 

[Westech]

Don't do it.... Your better off installing the correct 24v starter. When going to 12v the TM's become useless. Also there always seams to be issues after and major charging problems.

 

[FMJ]

http://www.roscommonequipmentcenter.com/nn10.pdf

 

[dependable]

The short answer is yes. But you realize you still need two batteries right? All the civilian 12V 6.2s came with two batteries and needed them. You might be able to start engine with one big new one on a warm day, other than that, you will go though starters due to lack of amps.

 

[FMJ]

http://www.roscommonequipmentcenter.com/nn10.pdf

Compare this to the wiring in your truck.