98 E-250 trailer (frame mounted) battery, 5.4L

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98 E-250 trailer (frame mounted) battery, 5.4L

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98 E-250 trailer (frame mounted) battery, 5.4L - 8/28/2008 4:49:48 PM

jkgray80

Posts: 6
Score: 0
Joined: 8/28/2008
Status: offline

Is anyone familiar w/how & when the trailer (frame mounted)battery is charged? Does it just deal w/trailer lighting/brakes or does it supplement main battery? On the aux battery relay (under main battery tray) I am getting aux battery voltage on rear post, alt voltage on front post & have constant power at relay switch w/control wire unplugged. (even with key off). I assumed the relay to be internally shorted. Called ford & asked if aux battery relay was same part # as starter relay (looks very similiar). It is not. I work on chevs & have no access to any ford data. Any thoughts?
thanks