Auxiliary fuse box

[ecullen999]

I have a2021 3500 diesel with an aux fuse box with 3, 50 amp fuses and 3, relays does anyone know what they are used for??? On my 2016 2500 I had a dedicated 8 gauge cable run directly from battery’s thru appropriate breakers and continuous duty solenoid to the rear of truck for trailer battery charging on long trips (big inverter in trailer). I am trying to do something similar and thought those auxiliary fuses might go to some up fitter wire ???? Any suggestions. Thanks

 

[Jimmy07]

Those are for the electric PTC cabin heater that supply heat in the cab while the engine coolant is warming up.

 

[Brutal_HO]

The AUX PDC is also used when fitted with the AUX switch option.

It's a possible DIY retrofit but the factory wiring isn't all there.

If you're going to run heavy cable, there's a HAPP connector block on the battery that's good for 300A. Chassis ground is only good to 50A.

 

[ecullen999]

Those are for the electric PTC cabin heater that supply heat in the cab while the engine coolant is warming up.

Thanks

 

[ecullen999]

The AUX PDC is also used when fitted with the AUX switch option.

It's a possible DIY retrofit but the factory wiring isn't all there.

If you're going to run heavy cable, there's a HAPP connector block on the battery that's good for 300A. Chassis ground is only good to 50A.

Is that Happ connection fused? I have a setup of 8 guage cable to an Anderson connector with a 200 amp marine grade resettable circuit breaker And continuous duty solenoid that I used in my 2500 Ram but space under the hood seems limited on the 3500 what do you think?

 

[ecullen999]

Is that Happ connection fused? I have a setup of 8 guage cable to an Anderson connector with a 200 amp marine grade resettable circuit breaker And continuous duty solenoid that I used in my 2500 Ram but space under the hood seems limited on the 3500 what do you think? The fusing would only be for catastrophe ie: direct short somewhere along the line

 

[H3LZSN1P3R]

No its not fused i run my plow off the happ connection to the solenoid

 

[ecullen999]

The AUX PDC is also used when fitted with the AUX switch option.

It's a possible DIY retrofit but the factory wiring isn't all there.

If you're going to run heavy cable, there's a HAPP connector block on the battery that's good for 300A. Chassis ground is only good to 50A.

Thanks I bought the aftermarket aux switch kit for my 2016 Ram and the app to set up the switches in the computer and never installed it ‍Traded it in before I “got to it”. If anyone wants the kit I’ll send it hate to see it go to waste