Heater Blower To Toggle Switch

[Hummer Guy]

I decided to try and get my heater working because it sucks not having defrosters in the morning. I've changed the blower motor box and it's still not working. I'm thinking about wiring the blower motor directly to a toggle switch and relay. Would there be any negative effect in going this route?

 

[Mogman]

You can wire directly to a switch if it is heavy enough, but why not actually troubleshoot and fix the problem?
Have you pulled the inst. panel and checked the switch and resistor for voltage?

 

[TOBASH]

Years ago, maybe 2019, a member replaced the heater box with aftermarket parts that were placed just behind the doghouse. Big heat exchanger and huge fans. Looked robust and warm as Heck.

EDIT- I found the link… You should start from the OP first post.

HMMWV Heating System Upgrade

Greetings members, First, I like to apologize for the long delay in getting this video completed. Because of the file size, I placed it on Youtube. I filmed the video in 4K to make sure you can see any important detail you may need to assist with the mods. This is a 60,000 BTU heating system...

www.steelsoldiers.com

 

[Retiredwarhorses]

I decided to try and get my heater working because it sucks not having defrosters in the morning. I've changed the blower motor box and it's still not working. I'm thinking about wiring the blower motor directly to a toggle switch and relay. Would there be any negative effect in going this route?

the heater is the simplest of designs you will find, you either have power at the blower end or you don’t when the truck is running and the fan switch is on high, if not? You need to start behind the instrument cluster, there is a single power wire to the center of the blower switch…

 

[Hummer Guy]

Years ago, maybe 2019, a member replaced the heater box with aftermarket parts that were placed just behind the doghouse. Big heat exchanger and huge fans. Looked robust and warm as Heck.

EDIT- I found the link… You should start from the OP first post.

HMMWV Heating System Upgrade

Greetings members, First, I like to apologize for the long delay in getting this video completed. Because of the file size, I placed it on Youtube. I filmed the video in 4K to make sure you can see any important detail you may need to assist with the mods. This is a 60,000 BTU heating system...

www.steelsoldiers.com

I seen that but didn't want to go that much into building a heating system since it doesn't get that cold here, I mainly just need defrosters

 

[Hummer Guy]

the heater is the simplest of designs you will find, you either have power at the blower end or you don’t when the truck is running and the fan switch is on high, if not? You need to start behind the instrument cluster, there is a single power wire to the center of the blower switch…

That's my problem most likely, I try to turn it on with the switch only in run, not when the truck was running, I'll get my radiator back connected and try that