Random Battery Death?
Lead Driver
Joined: Nov 2007
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Thaaaat's right. I'm glad it's cluttering up a drawer, er I mean, installed on your wife's truck now. I just never got around to installing that particular cam. That's great it's, uh, being put to good use, for something. 
FTE Leadership Emeritus
Joined: Sep 2003
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From: Houston, Texas
Looks like my problem was indeed a bad battery. They tested it at O'reilly and whatever connected the two posts internally had basically come apart.
Got two new top of the line batteries, slapped them on the 6.0, and put the old but good Duralast Gold 6.0 batteries on the 7.3. Both trucks are happy now.
Hope your situation is cheaper to resolve
Got two new top of the line batteries, slapped them on the 6.0, and put the old but good Duralast Gold 6.0 batteries on the 7.3. Both trucks are happy now.
Hope your situation is cheaper to resolve
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New User
Joined: Aug 2014
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I think I finally found the problem. Started going through the fuses one by once this morning. Pull fuse shut door check meter. Took a while to get through them. Had a drop to near 0 when I pulled the fuse for the rear wiper motor. I read some where that motor can seize up and draw a lot of power even with the key out. Pretty sure the motor needs to be replaced, how do you get the trim off to get to the motor?
Thanks for all of the help, this forum is great. Saved me a ton of cash not having to pay a mechanic to figure it out. I'm off to buy a new battery the optima is dead from being cycled too many times. Again thanks for the help guys.
Thanks for all of the help, this forum is great. Saved me a ton of cash not having to pay a mechanic to figure it out. I'm off to buy a new battery the optima is dead from being cycled too many times. Again thanks for the help guys.
Lead Driver
Joined: Nov 2007
Posts: 5,139
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Wise move to put the new batts in the 6.0, TD. Hopefully that solves your problem. 
Glad you're onto something, Rev. Remove the interior rear hatch handle(bolts under decorative caps), and the interior trim will pull out. They are secured with friction pins/clips, IIRC. Once you're in there, disconnect the wiper motor pigtail, reinstall your fuse, and do your electrical load test again to verify that the motor itself is the real source of the problem. I'd have to look through my diagrams to see what feeds the motor. It shouldn't be getting power if its not being commanded to run. You might have to start working your way through that circuit to the front to find the fault. Leaving the fuse out for now is fine until you track down the root cause.
Glad you're onto something, Rev. Remove the interior rear hatch handle(bolts under decorative caps), and the interior trim will pull out. They are secured with friction pins/clips, IIRC. Once you're in there, disconnect the wiper motor pigtail, reinstall your fuse, and do your electrical load test again to verify that the motor itself is the real source of the problem. I'd have to look through my diagrams to see what feeds the motor. It shouldn't be getting power if its not being commanded to run. You might have to start working your way through that circuit to the front to find the fault. Leaving the fuse out for now is fine until you track down the root cause.
Lead Driver
Joined: Nov 2007
Posts: 5,139
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Another thought, Rev. Have you checked to make sure the rear wiper switch is actually off? If the motor were siezed, I could see it draining the battery if it were in an "on" position. If it weren't moving, you wouldn't even think it needed to be turned off.
Lead Driver
Joined: Nov 2007
Posts: 5,139
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Here's something else to chew on, Rev. The original author has an 03 X, so some of the specifics may not apply. Regardless, there is some useful information in the thread.
Click here...
Click here...
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bakos
1987 - 1996 F150 & Larger F-Series Trucks
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Jan 16, 2013 04:07 PM
