Heater Frustrations
Elder User
Joined: Dec 2008
Posts: 745
Likes: 4
From: North Carolina
I read this a little differently...
pin 7 to ground should have about 12V when in run
pin 4 should have 12V when in run
If you jump pin 3 to 7 you should get something less than 12V when in run and that value should change when you change the temperature pot **** position.
EDIT: of course you have to test these pins without disconnecting the connector (C289)
Actually, if you disconnect C289 you can just test resistance between 3 and 7.... there should be continuity, but it should have some resistance that should change when you turn that heat temp control ****... If you don't get any continuity between 3 and 7 then your **** is probably bad.
pin 7 to ground should have about 12V when in run
pin 4 should have 12V when in run
If you jump pin 3 to 7 you should get something less than 12V when in run and that value should change when you change the temperature pot **** position.
EDIT: of course you have to test these pins without disconnecting the connector (C289)
Actually, if you disconnect C289 you can just test resistance between 3 and 7.... there should be continuity, but it should have some resistance that should change when you turn that heat temp control ****... If you don't get any continuity between 3 and 7 then your **** is probably bad.
Thread Starter
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New User
Joined: Oct 2010
Posts: 8
Likes: 0
From: Alberta, Canada
I was probing the terminals on the C289 plug & then the heat started all at once for some reason. I thought that some wires or terminals might be loose but I tugged each one individually but nothing unusual was found. Tried out different settings & all works well. It works now & I am happy with it but it may not work again. At least I am better informed on how it works now. Question for Mr Chamberlain, where do you find your info at ? It is super to know this stuff. Thank you & to everyone else.
Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
I have a subscription to the factory Ford service manual from alldata.
It is ALLDATAdiy.com :: Leading Source of Diagnostic and Repair Information. Subscriptions start at 15.99 per year, I think. I'm not sure it's the best resource. Sometimes it's really hard to find stuff. But it's helped me a lot so far.
It is ALLDATAdiy.com :: Leading Source of Diagnostic and Repair Information. Subscriptions start at 15.99 per year, I think. I'm not sure it's the best resource. Sometimes it's really hard to find stuff. But it's helped me a lot so far.
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