The heater in my truck is draining the battery but when the fuse is pulled out it no longer drains it.

Tiny
JESICA
  • MEMBER
  • 1999 FORD F-150
  • 120,000 MILES
How can I fix this problem or find out what part of the heater and why it is draining the battery? Thanks so much for your help!
Wednesday, January 25th, 2012 AT 2:44 AM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
Check to see if there is a draw from the blower motor. If there is, trace it to find where it is coming from.
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Wednesday, January 25th, 2012 AT 3:34 AM
Tiny
JESICA
  • MEMBER
  • 2 POSTS
OK, Can you tell me how to tell if there is a draw? And then how to trace it? I really appreciate it. I have worked on a lot of older vehicles but never something this new and its my sisters we really need to find out what the problem is to avoid the 85 an hour to have it looked at. Thanks so much! Jes
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Wednesday, January 25th, 2012 AT 6:17 AM
Tiny
HOMER1967
  • MECHANIC
  • 875 POSTS
Parasitic draw testing requires at least a digital multimeter and an understanding of how and where to hook it up. Your best bet would be to pay a pro to do it because if you don't know what your doing and go poking and probing wires you can do more harm than good.
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Monday, January 30th, 2012 AT 12:20 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
It is easy to check for a draw. Go to our homepage under the DIY section and find how to check for an electrical draw.
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Monday, January 30th, 2012 AT 12:22 AM
Tiny
JESICA
  • MEMBER
  • 2 POSTS
Thank you for your help. I bought a multimeter and tested it found that the problem was coming from the wires leading to the alternator. I dont know much about wiring but thank god for living in a small town I took it over to a neighbors house who works for a ford dealer and he got in there and repaired the problem. I am used to a 79 chevy. You open the hood and oh, there it is. :) Anyway we got it and my husband is very proud (he works out of state and usually takes care of these things) Thanks so much! Jesica
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Monday, January 30th, 2012 AT 1:35 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
Glad to help, Jessica. I still have my 78 Chevy Stepside. I redid it about 10 years ago and it has been in a garage since. Maybe this summer I will get it out and drive it again. Only 80K miles on it.
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Monday, January 30th, 2012 AT 1:51 AM

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