heater & battery drain problem
 

So I found the problem with my battery drain issue using the negative battery cable test method. Shows there is a short. Found out it was a short and was fixed by pulling the a/c fuse. I also found this behind the glove box. Seems the p/o jumped the heater blower. Does anyone know what connection is missing here? When the ignition is off there is no power going to this wire but when using the negative battey cable with a test light it tells me I have a short and it all comes down to this. I disconnect the jumper and the short goes away but I have no heater.

Re: heater & battery drain problem
 

I'm pretty sure that plugs into the two speed relay on top of the heater box

Re: heater & battery drain problem
 

Your heater switch connector and the resistor is shown below.

You have a 14 gauge brown wire going from the fuse panel heater switch 10 amp fuse to the heater switch shown just below the ignition switch in the diagram below. It is a three speed switch, low. medium, and high.

The brown wire is the power wire to the switch and it connects to the blue wire and the yellow wire which go to the resistor for the low and medium speeds. These two wires run through the resistor coils depending on which speed is selected.

The orange wire is for the high speed fan which also runs to the resistor where it ties into the other two wires and then goes on to the fan. It does not go through the resistor coils, but the blue and yellow wires do and then they tie into the orange wire.

There is no relay in the heater circuit unless it came from the factory


Attachment 1371791

Re: heater & battery drain problem
 

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Here is a picture of the fan speed resistor and where it is located in the top of the inside heater box.

LockDoc

Re: heater & battery drain problem
 

I called it a relay should have said resister It is still located on top of the heater box in my truck

Re: heater & battery drain problem
 

I was pretty sure that's what you meant and I got interrupted when I was typing my last sentence and should have said,


There is no relay in the heater circuit unless it came from the factory with air conditioning.

Re: heater & battery drain problem
 

Thanks. I guess thats what I was missing.