Battery Drain
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New User
Joined: Aug 2003
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From: New England, North of Bos
Battery Drain
1986 XLT 5.0L EFI 132000 miles
I Recently had some starting trouble that pointed to a dead battery. After replacing the battery and starter, I noticed a ton of corrosion around the battery cables, and solonoid. So, change 'um I did, and after changing out I got some wierd reading with my meter. Thinking it may be an alternater issue I first disconnected the alternator harnesses.
The battery disconnected is reading approx. 12V.
With the battery connected both Pos and Neg, it read approx 6.5V and was
dropping.
One by one I eliminated the fusible links on the solonoid and found that the one causing the drain was the black/orange link that feeds down to the alternator. I was getting a drain even with the Alt. harness disconnected!!
Any ideas?????
-Deac1970
I Recently had some starting trouble that pointed to a dead battery. After replacing the battery and starter, I noticed a ton of corrosion around the battery cables, and solonoid. So, change 'um I did, and after changing out I got some wierd reading with my meter. Thinking it may be an alternater issue I first disconnected the alternator harnesses.
The battery disconnected is reading approx. 12V.
With the battery connected both Pos and Neg, it read approx 6.5V and was
dropping.
One by one I eliminated the fusible links on the solonoid and found that the one causing the drain was the black/orange link that feeds down to the alternator. I was getting a drain even with the Alt. harness disconnected!!
Any ideas?????
-Deac1970
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New User
Joined: Aug 2003
Posts: 11
Likes: 0
From: New England, North of Bos
New Findings but Still stumped
after changing out a couple of fusible links and a broken alternator wire, the battery was still being drained so I started pulling fuses. When I pulled the courtesy light fuse, the battery drain stopped.
Does anyone have any ideas??
-deac1970
Does anyone have any ideas??
-deac1970
Fleet Mechanic
Joined: Aug 2002
Posts: 1,563
Likes: 33
From: Swansea SC
Also consider this, what else is on that fuse, I own a 185 f-150 and had the same problem. It turned out to be the electric choke. The relay under the dash went south ( contacts closed) Draining my battery .I dont know whatelse is on your courtesty circuit, but also gives direction for another possiblilty. Good luck TR 
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