Please Dear God, can Someone Help?

[Phillfam99]

I have a 1966 Chevrolet C10 Pickup. When I bought it, there was not a single heater componant in the truck. Someone had bondo'ed off the holes for it. I went down to a junk yard and pulled the complete heater system from a 65 Chevy short bed. At the same time I pulled the underdash wiring harness. I installed these both in my 66. Everything was working fine untill one day when I went to turn the heater on, I saw a flash from my fuse panel. It was the 10a fuse from the heater. So I went to trouble shooting. I found that the heater resistor switch (the switch in the heater distributor) was broken. So I purchased the heater resistor switch and the heater control switch as well. I have properly installed both of them. I then checked all my wires and I keep blowing fuses. It is getting colder outside. I really need to fix this problem. Anyone know what the deal is?

[jjcom]

Check to see if any wires are grounding out. You can use a voltmeter if it can measure resistance. Put one connector on a wire that should be hot and the other connector to metal in the truck, a ground.

Are you sure a 10amp fuse is big enough? I don't know much about that truck, but just another thought I had.

[Oldcar_Mechanic]

I agree with jjcom. It sounds like you may have a direct short to ground someplace. Possibly a bare wire that has vibrated close to metal.
Most heaters are 15 amp fuses and 25 or 30 if you have A/C. The higher amps on the A/C is due to the load from the compressor.

Ron

[Phillfam99]

I pulled the blower motor out and tested it. It was blown. I also used a volt meter to check and see how many volts I was sending to the motor. When I turned it on, it was sending 14.6 volts to the puppy. So, I guess I was sending too much for the fuse to handle. And my motor was bad. Thanks for your help.

[Oldcar_Mechanic]

14.6 is not bad. That is a normal voltage for an alternator to put out. The fuse will blow to protect the circuit, so it still sounds like you have a problem. I would check to see what the voltage to the blower is. Your whole problem may have just been a bad blower motor.

Ron

[Phillfam99]

Eureka!! It was the blower motor. Thanks for your help guys. I really appreciate it.

[Chester]

Just a comment on this. Amperage blows fuses, volts don't.

[MikeKy55]

Glad you got it Gary. WETSUS