Harvey,
You're right, SOME factory tow packages include an isolator relay;
there's a spot for one in my Dodge truck. The relay is normally powered
up only when the ignition switch is "on".
<<Jim>>
Harvey Barlow wrote:
>
> Lan & Jim,
>
> The isolator that Jim spoke of may already be provided by the factory. I
> think most of the later model tow vehicles, at least those with factory tow
> packages, isolate the charge line when the ignition switch is turned off.
> My faithful old '94 Ford only provides power to the trailer charge line when
> the ignition switch is in the on position. I've never looked for it but I
> assume the ignition switch routes low amperage current to the relay which
> actually controls charge line current.
>
> Harvey
>
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<<lower SE Michigan, USA>>
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