Blower Motor Systems Without Relays

Just for a heads up- I had a come-back-after 13 months- was on an ’05 Dodge Ram 2500 diesel- the R/S brain box had a hole melted in it- the engine starter ran until it quit- Truck was under warranty- I thought owner was dead meat- he would have to pay for starter replacement due to fault of remote starter- But dealer took care of it- wow. Anyway, the R/S tech says that this truck is known to have had problems- that ANY remote starter installed on this should always have an external relay put in to run the blower motor.

I pulled up the wiring diagram for this truck- he is correct in that it does not have any relay anywhere in the circuit- so all 25 or more amps of the blower motor must go through the brain box when blower is on high speed- I was not aware when I installed the unit that this was the case- nowhere in any wiring diagram, or in any instructions was there a note or even suggesting that I test for amp draw. I say the unit should have blown the 30 amp fuse first- before melting a hole inside the brain box- so therefore it is a design issue. There was also an issue where Dodge trucks in ’03 and ’04 were recalled for blower motors burning up the 40 amp ignition wiring- according to the tech-

I am asking if any of you other installers have ever experienced this- and what other vehicles have massive amp draw (don’t use relays) when dealing with the blower motors- and how many of you actually check for systems without relays prior to your install- Thanks for a great forum

Had that happen to a Relay, which shorted the circuit.

There are a few wiring Guides that mention it now.

Another fine idea by MOPAR