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Electric tarp cover fail


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So yesterday my electrical tarp cover stopped working on my 2000 Mack rd with Hrg 15 yard body. I check the switch and Solonoid and all seems to be working . I get power up to the motor . One sides hot for open and the other side hot for close when switch is pressed but motor doesn’t spin until you ground motor to bed . I think it’s a ground issue but my new dunp bed sub frame is welded and bolted to Mack frame so what could be causing this . Please help

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this does not sound rite. 

on my electric tarps, there is two wires going to the motor. 

there is no ground to the body.

the tarp motor is a simple DC motor. to reverse direction you reverse polarity of the power wires.

when in cover position, power is on one terminal and ground is on the other.

when in uncover position, power and grounds are reversed.

the tarp motor works the same as a power window motor does. 

when you are up to your armpits in alligators,

it is hard to remember you only came in to drain the swamp..

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Is there a ground wire in the switch connector like a power window switch?

"OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK"  Thomas Edison

 “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’

P.T.CHESHIRE

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Yes the ground wit and power wit come from battery to a relay box with three wire that run to a open and close switch . I put a test light on the relay box and both sides light up on the relay incoming and outgoing . It has to be a ground issue I think because if I ground both poles to the bed and hit the switch it works quick . 

 

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  • 3 weeks later...

my 2 cents.  My buddys tarp motor was acting like that and one of the poles was broken free in the motor.  This was found after he brought it to my shop and he already replaced the switch and wire.  I disconnected the wires and hooked up to my multi meter they showed 12v ots both sides in accordance with the switch, if you grounded the motor it would work, I told him the motor was bad he didn't believe me so I took one I had and hooked it up and showed him.  Took the old one apart and the terminal was broken loose in the motor.

  • Like 2

Robert

"I reject your reality and substitute my own."

 

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  • 3 weeks later...

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