1994 Ford F-150 Fuse link

Tiny
NEW_F150_OWNER
  • MEMBER
  • 1994 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 269,000 MILES
My blower motor will not work in any switch position, and there is no current to it at all. The fuse under the dash checks OK. The blower motor resistor was found bad (black terminal rusted and fried), and so the resistor is now replaced. But still no power to blower. Could a fuse link have blown as a result of the fried resistor or the reverse? I have looked for a fuse link in the wires around the blower motor, but don't see any. The orange and brown motor wires disappear into the back of the squirrel-cage. I've searched for online schematics of where any fuse links might be located but nothing yet. Any help would be appreciated. Thanks!
Tuesday, August 17th, 2010 AT 9:58 PM

11 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Are you getting power to the switch?
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Wednesday, August 18th, 2010 AT 12:53 AM
Tiny
NEW_F150_OWNER
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  • 6 POSTS
Hi. Thanks for your reply. I'm not sure- there's power to AC condensor/clutch on the other knob but nothing to the fan/blower. Should I check contacts at back of that switch?
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Wednesday, August 18th, 2010 AT 1:11 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
That is where I would start. That way you will know which direction to work toward.
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Wednesday, August 18th, 2010 AT 1:49 AM
Tiny
NEW_F150_OWNER
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  • 6 POSTS
Ok, checked that- there is no power to the switch either. The same two brown and black wires that power the blower motor go into the switch, along with the 2 other wires that go into resistor (yellow, green, brown and black all go into resistor). Where does the system connect to common?
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Wednesday, August 18th, 2010 AT 8:33 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
The ground is a black wire behind the left cowl panel
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Wednesday, August 18th, 2010 AT 10:13 PM
Tiny
NEW_F150_OWNER
  • MEMBER
  • 6 POSTS
Ok, found that, and the blower fuse in the fuse box is ok, so the open line must be on the other side of the system. Can fuseable links be anywhere in that blower wiring harness? Like I said, the resistor had a burned-out terminal, so I'm suspecting there's a fuseable link that is also burned open. Is there a standard location for those? Thank you.
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Thursday, August 19th, 2010 AT 8:23 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
There isn't a fuseable link for this component. It is fused. As far as the burnt wire and resister, that can be caused by a blower motor that is drawing too many amps. It isn't uncommon.

As far as the problem, you must have a damaged power wire to the switch. Have you checked them for continunity?
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Thursday, August 19th, 2010 AT 9:36 PM
Tiny
NEW_F150_OWNER
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  • 6 POSTS
OK, thanks, that may have solved the problem. That made me get better at using the volt meter- there is power to the fuse box, then power at the motor, but none to the switch, yet the switch shows ground. So it looks to me like the motor itself is bad. I've ordered a new one and we'll see if thats the problem. Thanks!
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Friday, August 20th, 2010 AT 1:32 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Let me know how you make out with this.

Joe
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Friday, August 20th, 2010 AT 10:59 PM
Tiny
NEW_F150_OWNER
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  • 6 POSTS
Yes, that was it. The motor had blown as well. New one is working now. Thanks for your help!
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Saturday, August 21st, 2010 AT 2:56 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Great! I'm glad it's fixed. Let us know if you have questions in the future, and thanks for using 2carpros. Com.

Take care,
Joe
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Saturday, August 21st, 2010 AT 9:38 PM

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