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huffy47
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Dec 30, 2012, 10:44 AM
Post #1 of 8
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Fuse or Relay Ford F250
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I have a 2002 heavy duty 4 wheel drive F-250 with a V8 engine with just a little over 67000 miles on it. My question is how do I kill the power to the AC compressor as I believe it is causing my battery to go dead. Is there a fuse or relay that I can take out and if so where are they located? When I looked in my fuse panel everything is just numbers and nothing is labeled. Any info would be appreciated Thank You Huffy47
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Sidom
Veteran
/ Moderator
Dec 30, 2012, 10:58 AM
Post #2 of 8
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Re: Fuse or Relay Ford F250
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You can pull fuse #10 in the central box under the dash by the steering column....
What makes you think the a/c system is causing the draw?
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 30, 2012, 1:21 PM
Post #3 of 8
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Re: Fuse or Relay Ford F250
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I seriously doubt it is compressor. I don't remember it having a "key off" power supply.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
Dec 30, 2012, 1:27 PM
Post #4 of 8
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Re: Fuse or Relay Ford F250
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Contact side of relay hot all the time with key off on this particular one.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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huffy47
User
Dec 30, 2012, 1:56 PM
Post #5 of 8
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Re: Fuse or Relay Ford F250
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Not really sure that this is the problem but a friend who works on county trucks said they have had issues with AC causing batteries to go down so I figured it was worth a shot at fixing the problem otherwise I have to start tracing wires for a short and as you know that can become a pain in the but. Thanks for the info I will post if this works or not
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Discretesignals
Ultimate Carjunky
/ Moderator
Dec 30, 2012, 2:14 PM
Post #6 of 8
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Re: Fuse or Relay Ford F250
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If a wire has a short, you would have blown fuses. You need to use an amp meter and check for parasitic draw.
Watch this video on how to check for a draw. Most draws shouldn't be over 50 mA. (.050 V).
http://www.youtube.com/watch?v=KF1gijj03_0
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Dec 30, 2012, 2:18 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 2, 2013, 2:49 AM
Post #7 of 8
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Re: Fuse or Relay Ford F250
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Toss the relay. Less than $10 at dealer prices. If no go it's a spare........ ---------- Tom
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