I've used a trickle charger wired into the same plug as the
lower-radiator-hose heater when it was absolutely imperative that the
vehicle would start (Dodge B-350 service van for 2-way shop)
I put a heavy-duty strain-relief on the vehicle cord and would position the
extension cable from the house so that if I forgot to unplug it (2 AM
calls!) I'd back over the cord and 'automatically' unplug it
it was just one of those 'wire-pulling' braided things that electricians
slip over wires to pull them thru conduit, it works on the 'harder you pull
the tighter it gets' principle
I think it was made by Greenlee
ran the wire thru it ( you have to tape the end away from the attachment
point), and secured it to the rear door hinge so that about 6" of the wire
hung outside the side door
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