98 E-250 trailer (frame mounted) battery.

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98 E-250 trailer (frame mounted) battery.

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Ford >> Ford Trucks, Ford Vans & Ford SUV's >> Ford Econoline E Series >> 98 E-250 trailer (frame mounted) battery.

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98 E-250 trailer (frame mounted) battery. - 8/28/2008 3:59:19 PM

jkgray80

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Joined: 8/28/2008
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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

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RE: 98 E-250 trailer (frame mounted) battery. - 8/29/2008 1:22:08 PM

jkgray80

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Joined: 8/28/2008
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In case any one runs across this,
The aux battery relay works exactly the same as a starter relay, even though ford said it doesnt. All it does is join batteries together after the vehicle is started to charge both. My relay was internally shorted.

(in reply to jkgray80)

Post #: 2