CUCV M1009 Battery cut off switch

[bcolemanttu]

I have read every post I can find on this subject. I have read some say no, others say yes. I am determined to do this so can someone tell me the correct way and the best switch to use. I found a post recommending a switch and found out it was wrong so I need someone who really knows the M1009 system to please offer up their wisdom.

 

[Warthog]

What are you trying to accomplish?

 

[bcolemanttu]

Prevent frying electronics when something goes wrong and make it harder to steal.

 

[K9Vic]

Just put a cut-off on the pink wire on the IP, that will prevent it from starting.

Generally if you have a battery kill and there is no power, thieves will look for a cut off and may find it. If the truck turns over and does not start, they will just move on.

 

[Nowhereman]

If you are just trying to keep someone from stealing it use a chain and a pad lock like it is done in the Army. Bolt or weld the chain to the floor and wrap the chain around the steering wheel and lock it. It will keep an honest man honest.

 

[bcolemanttu]

What about the frying electronics. Is there not a correct way to install a cut off switch?

 

[richingalveston]

I believe it would require 2. one for the 24V and one for the 12V. Not sure you could do it by just disconnecting a neg. or just one Pos. wire.
check marine disconnects, You can prob. find a 24v that will carry enough amps.

Best theft switch is disconnecting the power wire to the IP.

 

[MarcusOReallyus]

What about the frying electronics. Is there not a correct way to install a cut off switch?

Best way to prevent that is with the doghead mod. That's the big one that has people scrambling to disconnect the batteries.

Really, if you have a problem with the electrical system, by the time you get the hood open and flip a switch, you've already got fried wires. You just aren't faster than electricity, even with a switch.

If you really insist on doing it, make sure it's a monster, and put the switch in the ground lead. If there's no ground path to the batteries, there's no current flowing anywhere. Just make sure the switch is disconnecting the ground COMPLETELY.

I think you're trying to solve a one-in-a-million problem, but suit yourself. It's your truck.

 

[Keith_J]

Actually, cutting power to the starter is where you want, if the starter sticks. The Doghead mod only addresses the under dash 12/24 relay problem, the actual starter solenoid which throws the starter drive into the ring gear and makes the connection between the batteries and the starter can also stick.

This will accomplish both of the thread starter's intents and is a bit more hidden than a simple battery disconnect.

 

[Warthog]

Read this thread

http://www.steelsoldiers.com/showth...fter-Starter-Run-on-Explained-and-Illustrated

Amphi explains how the CUCV system is setup and why a cut off for the batteries will not work in a electrical failure situation. Just disconnecting one battery causes a reverse polarity issue and will potentially fry some of the wiring and possibly some electrical items.

 

[bcolemanttu]

Keith _J sounds like your idea will accomplish what I want. Any particular type of switch or recommended location?

 

[Warthog]

If that is the way you want to go you will need to add the switch where the main battery feed comes off the 24v Positive Terminal Board.



While no one makes a plug and play setup for this you could make a box and install one of these switches



Or something like one of these:

https://www.google.com/search?q=bat...=6IAhVLC3HK_vigLctoCYAQ&ved=0CGAQsAQ#imgdii=_

The LSSVs use something very similar to this for when the truck is parked for a long period of time.

 

[richingalveston]

someone here is selling a keyed battery switch. It may work for your app. and having the key would be better than a switch

 

[eme411]

there is a switch that will do the job , I have one on all my WW 2 and M-series vehicles , they are common in all M-113's , military master kill switch , installed inside vehicle it will do what you need , it will require running your ground leads inside the truck and then back to the power bar,

 

[Warthog]

there is a switch that will do the job , I have one on all my WW 2 and M-series vehicles , they are common in all M-113's , military master kill switch , installed inside vehicle it will do what you need , it will require running your ground leads inside the truck and then back to the power bar,

One issue with that is that there are multiple battery grounds on the CUCV.

 

[bcolemanttu]

What if I used this switch and disconnected both the 12 and 24 at the same time with one switch.

[h=2]Heavy Duty Double Pole Battery Switch, 400A Continuous[/h]

 

[doghead]

Where would you mount such a switch? You going to run all the battery wires into the cab and mount it on your dash?

By the time you see smoke, it's going to be too late.

Preventative maintenance is your best option.

 

[MarcusOReallyus]

By the time you see smoke, it's going to be too late.

No, that can't be right. If that were true, you wouldn't see ANY vehicle come from the factor equipped with cut off switches for the starter!




Oh, wait....