Hmmwv 12 Volt Conversion

[Mogman]

CAMO is correct, my bad!
His encouragement is a little surprising, must be profit in it for him

 

[Milcommoguy]

CAMO is correct, my bad!
His encouragement is a little surprising, must be profit in it for him

Mulit-tasking at the moment. Got you guys on the computer and the queen going on the tele. As soon as they slam the lid... I have to get to work.

You would be supersized how LITTLE profit there is. Tax, parts, labor, supply chain, headache pills, etc.

Buying a HumV is easier to slip pass the BOSS. Wining for more money to fix the busted damn thing.... is the hard part. I have heard grown men crying when placing orders... LOL

Thinking of setting up a 1-800 call CAMO line. Operators standing by... Have your credit card ready.

I note your on here all the time. Is moderator a paid position? How do you get anything done LOL

There playing my song .... Marching right out to the shop now, CAMO

 

[maxpower_365]

Can someone explain and/or show me pictures of the best way to run 12V accessories? I see a lot of videos on YouTube where people use 24/12V step down converters, but it looks like they run them directly off the battery and then into a fuse block. I want to have all my 12V accessories switched with the ignition so that I don't accidentally leave accessories on that run down the battery. Is there a way to do this? I saw one video that used a continuous duty 24V solenoid that was activated by the ignition. Seems like a decent way to go, but there were also comments from other users that said it was way more complicated than it needed to be. Is there a simpler way?

 

[Mogman]

That is the way I do it.

 

[Coug]

Simplest method if using a 24-12 step down converter is the Orion 70 amp by Victron. It has a built in relay that just requires a 24V signal to turn it on and off.
The fan circuit is an easy to access circuit for switched power on a 3 speed truck, and a 4 speed can use that or the input signal wire to the 12V relay behind the battery box to power the relay.

 

[maxpower_365]

Thanks for the input guys! A couple more questions:

Can someone explain the difference between a relay and a solenoid? They sound like they have similar functions, but I'm guessing there are times you use one over the other.

I've read it's a bad idea to just run leads off of one battery to get 12V. It seems like everyone recommends a 24-12 step down converter. What is the problem with just grabbing 12 volts from one battery? It seems like you could still use a relay linked to the ignition to only light up the 12V accessories when the truck is running. Do you shorten the life of the battery powering the 12V accessories?

 

[Mogman]

Thanks for the input guys! A couple more questions:

Can someone explain the difference between a relay and a solenoid? They sound like they have similar functions, but I'm guessing there are times you use one over the other.

I've read it's a bad idea to just run leads off of one battery to get 12V. It seems like everyone recommends a 24-12 step down converter. What is the problem with just grabbing 12 volts from one battery? It seems like you could still use a relay linked to the ignition to only light up the 12V accessories when the truck is running. Do you shorten the life of the battery powering the 12V accessories?

Generally speaking a relay has more than one set of contacts (SPDT, DPDT, TPDT etc) whilst a solenoid has but one set of contacts (SPST), otherwise they are the same basic device.
If you have a dual voltage system (100,200,400A alt) then you can tap 12v off of the "rear" battery but I would keep it under 15-20A total, it is said they are good for 50A but those regulators are very expensive.
If you do not have a dual voltage system you will cause an imbalance between the batteries and shorten their life considerably.

 

[maxpower_365]

Generally speaking a relay has more than one set of contacts (SPDT, DPDT, TPDT etc) whilst a solenoid has but one set of contacts (SPST), otherwise they are the same basic device.
If you have a dual voltage system (100,200,400A alt) then you can tap 12v off of the "rear" battery but I would keep it under 15-20A total, it is said they are good for 50A but those regulators are very expensive.
If you do not have a dual voltage system you will cause an imbalance between the batteries and shorten their life considerably.

Thanks Mogman.

How do I tell if I have a dual voltage system? Took the attached picture to ask a different question, but you can see part of my rear battery. Can you tell from that photo? If not, what do I need to take a picture of?