after engine swap---battery light on - Ford Powerstroke Diesel Forum
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Old 11-03-2012, 08:52 AM
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after engine swap---battery light on

i have a 1999 f250 super duty 7.3l. the orignial engine was bad so i just swapped it with a 2002 engine. it started right away, ran great, the only thing i noticed was the 'battery' light was on constantly. the alternator gauge was right in the middle between 8 and 18. the truck ran fine. now after 3 starts this morning, there isnt enough juice in the battery to crank it over.

im wondering what the problem is?

the only difference i notice between the new and old engine is 1 extra wire. on the passenger side there is a thick ground wire that comes off the top of the engine (near the gpr and aih) that runs to the passenger quarter panel. on the old engine there was only 1 thick wire. on the 2002 there is also a small thin wire that i dont know what it would go to. since the new engine is from a salvage yard they just cut everything so i dont know how long the original wire was or if it had some kind of connector on the end.

any1 know what that wire would be?
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Old 11-03-2012, 09:00 AM
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pics man, pics.
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Old 11-03-2012, 09:01 AM
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they must've installed the "grd" wire themselves, think'n the ground strap wasnt good enough..(strap located at p/s firewall to rear bolt next to downpipe).
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Old 11-03-2012, 09:38 AM
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i used the 2002 harness. it was on the engine when it showed up. so the 2002 had the extra wire

here is where the large wire connect to the quarter panel
https://www.dropbox.com/s/c2o1ibqx7m...2010.01.50.jpg

here is the large wire with the mystery wire coming out of it
https://www.dropbox.com/s/k63yy7utod...2010.02.16.jpg

sorry for the dropbox links,,,,,,,i couldnt get the pics to attach
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Old 11-03-2012, 12:10 PM
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i cant get pics to load?
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Old 11-03-2012, 01:16 PM
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https://www.dropbox.com/s/k63yy7utod...2010.02.16.jpg
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Old 11-03-2012, 01:16 PM
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https://www.dropbox.com/s/c2o1ibqx7m...2010.01.50.jpg

Maybe this will work
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