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Roadmaster 156-25 - Ensure Ground and Test Functionality

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If helpful, you may use the included 5/16” ring terminal to
attach it. The vehicle’s engine must be off when you attach the
wire to the post.
7. Ensure that a good ground exists between the frame of
the towing vehicle and the frame of the towed vehicle.
Note: to confirm that the charge line is functioning…
With the charge line connected from the motorhome to
the towed vehicle and the motorhome engine running, discon-
nect the red wire from the towed vehicle’s positive battery post.
Connect a volt meter or test light from the red wire to
the towed vehicle’s ground.
If the volt meter or test light indicates 12 VDC
+
, the
charge line is functioning.

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