12 volt swap over.

[79 oshkosh 2323]

Is swapping over to 12v somwhat simple. Can you just run the buss bars 12 volt. Run one alt and change the starter and run the batters in series ++ --. I have a hard time finding things in the tms. Lots of knowlage here and people who have allready made the mistakes i dont want to make. I do owe you guys a thank you. This site has been a big help to me.

 

[MarcusOReallyus]

run the batters in series ++ --.

Whoa there, pardner. Series gets you 24v - that's how they are set up now.

What you are describing, and what you want for 12v operation, is a parallel connection.

 

[79 oshkosh 2323]

Im looking for mostly 12 volt. Im not sure how these are wired and how they get 24 volt out of that system. Im handy when it comes to doing my own stuff but didn't want to hack it up.

 

[Warthog]

This NOT meant to sound mean or abusive. It is for everyone.

if you can't understand how the 24v system is setup and operates, what on the world makes you think you can understand how to "convert" any trucks wiring? You have to have some understanding of electricity.

Now converting a CUCV to 12v isn't that hard. There are documented procedures to do it. Those procedures are not in the TMs.

So we help someone convert the system to 12v, the truck is sold and the new owner comes back asking "what has been done to my truck?". We end up spending hours trying to figure it out. Just this week this happened. I personally have spent about 4 hours helping with one truck. What is my time worth? Shops get $90+ per hour.

 

[camp9]

There are some helpful outlines in the frequently asked questions cucv section of the forum, right on the top. Go there tab down and you'll find a bunch of threads on converting over. Hope this helps.

 

[tourus]

when I converted my truck to 12 volt. I bypassed the resister on the fire wall. then I took both altenaters out and in stalled two 12 volt altenators. (just faster and alot easier than the rosinall convertion). put a gear reduction 12 volt started in. that is the down and dirty vertion of how to do it. I did that then moved on been 5 years NO electrical problems as of yet. now there are alot of other ways but that was fast and easy. to hook up the alts. I just hook them up just like they were and on the passinger side run an extra ground wire no promblem. you could even run just one altenater if you wanted to.

 

[MarcusOReallyus]

that is the down and dirty vertion of how to do it.

Down and dirty and missing a few critical steps!

 

[Warthog]

Let's look at this:

I bypassed the resister on the fire wall.

The resistor pack has nothing to do with the charging system. It does control the glowplugs. If converting to 12v, this is needed

then I took both altenaters out and in stalled two 12 volt altenators.(just faster and alot easier than the rosinall convertion).

The CUCV alternators are 12v They just don't use the casing for the ground. You can use the CUCV alternator on just about anything if you add an extra ground wire. The Rosscommonequipment conversion is very simple. Remove wires, tape them up, install a new starter and your done. Did you remove the wire connecting the two systems together? If not I'm surprised that something didn't shortout. And why 2 alternators?

put a gear reduction 12 volt started in.

Okay, that is needed.

that is the down and dirty vertion of how to do it. I did that then moved on been 5 years NO electrical problems as of yet. now there are alot of other ways but that was fast and easy.

The OP needs complete instructions, not highlights.

to hook up the alts. I just hook them up just like they were and on the passinger side run an extra ground wire no promblem. you could even run just one altenater if you wanted to.

Again why use 2 alternators (purchase cost) when converting to 12v?

Think about your post. We have a newbie that doesn't understand electrical systems. You post some generic info without explanation. How does that help? It may even cause some issues as it increases that chance that he could hurt himself or his truck.

I am NOT discouraging you from posting, just asking that you give some more detail and try to explain what you are doing. Helps everyone learn something.

 

[79 oshkosh 2323]

I didn't mean to get any one discouraged at other peoples post. Im not use to the 24 volt system thats why i had intentions on swapping over. i welcome anyones help. Im a 20 year veteran of working on trucks and equipment allthough i was never in the armed services i love the military trucks and also a proud supporter of the veterans ( thanks to all of you). i do know some things but not to much about 24 volt systems.I guess i could read more about it and that would help me get to like it a little more. Thanks for the information guys.

 

[doghead]

Why change something you do not fully understand, to something else you do not fully understand?

 

[Warthog]

I didn't mean to get any one discouraged at other peoples post. Im not use to the 24 volt system thats why i had intentions on swapping over. i welcome anyones help. Im a 20 year veteran of working on trucks and equipment allthough i was never in the armed services i love the military trucks and also a proud supporter of the veterans ( thanks to all of you). i do know some things but not to much about 24 volt systems.I guess i could read more about it and that would help me get to like it a little more. Thanks for the information guys.

We are NOT trying to discourage you from making your truck usefull to your needs. Just think it thru before jumping in.

Read this report if you are going to convert. Easy to do and easy to undo for a future owner. And easy for us to help with any issues.

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

The stock CUCV system is just two 12v circuits that happen to be tied together. The GEN2 (passenger) alternator has a special housing that isolates the internal circuits from the case, thus it is called an "isolated ground" unit. The GEN1 is also an isolated ground so the military only had to stock one unit.

Look for threads by AMPHI. He has tried to explain the design in simplified terms.

 

[MarcusOReallyus]

Im not use to the 24 volt system ...i do know some things but not to much about 24 volt systems.I guess i could read more about it and that would help me get to like it a little more. Thanks for the information guys.

That sounds like a good plan. If it's working fine now, you might want to live with it a while and get comfortable with it, see how you like it. It really could be a good learning experience.

Then, later, if you decide you want to, you can always convert it.

But hey, it's your truck, make yourself happy!

 

[79 oshkosh 2323]

# 2 Alternator ground wire.

My truck came with #2 alt (passinger side ) off the truck. It has the plug with the 2 wires, then it has 2 red wires that go on the battery stud. I dont see no ground wire to put on the ground stud. Where does it come from and does it go on the ground stud. My drivers side has a ground wire on it also. Can i just copy that one.does someone no the # for the belt on the passinger side.

 

[doghead]

To get a correct answer, you must explain what you are attempting to accomplish.

If you have already posted a thread on this topic, then continue it.

If you have not, then start with a clear explanation of what you are trying to do. Is the truck stock? Was there a problem?

 

[doghead]

The belt number is listed in the stickies and or wiki at the top of the cucv forum(I know others suggested you read them).

The schematics are listed in the back of the -20P and -34P TMs.

In a stock 24 volt cucv, the second alt(PS side) is NOT grounded. That is why it has an isolated ground alternator.

 

[79 oshkosh 2323]

thank you

 

[swbradley1]

I merged your two threads covering your alternator questions. Please refrain from starting multiple threads on the same thing.

 

[doghead]

Steve, I'm not sure if he is trying to convert to 12V or repair/restore to stock. He still hasn't made that clear. Merging isn't good if he is staying stock.

 

[79 oshkosh 2323]

Ok sorry. Im going stay with 24 volt.i thought the passinger side alt was the one that needed to be grounded but it is the drivers side as someone has posted. I was wondering why it had 2 red wires going to the battery post on the alt.(Pass side ).Sorry for the mix up on the post.i m going to take the advice and stay with 24 volts. thanks

 

[swbradley1]

Steve, I'm not sure if he is trying to convert to 12V or repair/restore to stock. He still hasn't made that clear. Merging isn't good if he is staying stock.

Yeah, that and multiple threads not knowing didn't help.