Blower motor shuts off when I turn my lights on 98 dodge ram 1500 5.2L

Asked by Aug 25, 2016 at 07:49 PM about the 1998 Dodge Ram 1500 4 Dr Laramie SLT 4WD Extended Cab SB

Question type: Maintenance & Repair

I am a diesel mechanic and have a good amount of experience but, this
one has me stumed. The blower motor works fine in all speeds so that
checks off the motor itself and  the resistor as a problem. What happens is
when the parking/dash lights  are turned on ( one click on the light switch )
The blower motor completely stops. First Idea was a weak ground. I tested
every ground that had even a remote connection to this circuit. They all
passed with in the noise. So I tracked down the common power line to the
blower motor controller and the light switch ( and orange keyed power
source) I put my test leads on it to see if I could find any weird behavior.
With the lights off every thing seemed golden bouncing between .4 and .8
volts and with in the noise in resistance everywhere I could test it. So I
assume there is no whack shorts. I then turned the lights on with my test
lead in the controller's side of the wire and the wire jumped 10v. That does
not seem right to me. Any ideas ?

4 Answers

31,495

From the web...."The blower speed switch and the lights that illuminate the heater controls share a common ground. You have a bad ground with that circuit. So when your lights are off, your blower is finding a ground, "backwards" through all of your lights. When you turn the dash lights on, the ground goes away." I hope this helps.

1 out of 1 people think this is helpful.
Best Answer

Any clue where the ground is I believe It is g201 and I thought I checked it.

31,495

No, sorry you will have to examine all the associated wiring. I would start at the heater control lights and see where they ground to.

Possibly ground it separately ?

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