Heater motor fuse popping
 

Hi all! My '67 C10 is still on the road, and hauls my '62 Airstream Overlander (I live in it full time). As you know, it's often a joy but sometimes frustrating to keep everything working, and this time I'm stumped... may I get your insight?

Heater fan motor keeps popping it's 10a fuse. ...I've already replaced the motor, switch, speed resistor. I actually bypassed the fuse panel and am using an inline 10a ATO fuse. I inspected the original heater harness and it's in good shape. The connection between the fuse and harness connector is good, multi-meter doesn't seem to show resistance. Motor is grounded well.

Symptoms: When I replace a fuse, the motor runs at all speeds when the engine is stopped. When I start the truck, the fuse pops when fan is at high speed, sometimes lower.

I'm defeated, do you have any ideas? Only thing I can think of is a failing voltage regulator, since I notice, momentarily on occasion, the power fluctuates and the engine sputters at idle?

Thanks for your help!

Re: Heater motor fuse popping
 

I'll add that even a 25a fuse pops...

Re: Heater motor fuse popping
 

Here's someone who had the same problem and fixed it by cleaning up the ground connection.

http://67-72chevytrucks.com/vboard/s...d.php?t=727010

Re: Heater motor fuse popping
 

You shot down my first thought with your second post. 10 amp fuse is not enough for a blower motor.
Put a volt meter on the battery & see what the charging voltage is. It should be around 14 volts. No more then 14.5 & steady with the engine about 1500 rpm or higher.

George

Re: Heater motor fuse popping
 

Thanks I'll try that again, though I scraped the ground before and secured it tightly!

Re: Heater motor fuse popping
 

Yes I'll do those tests, thank you again! I looked it up and 10a is correct for the blower motor, and I wouldn't want to risk overheating wiring. I hope I can nail this down, fingers crossed.