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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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Run a decent size wire from the truck frame to the box frame for ground or wait till you lift the box  a bit to establish a descent ground 

Edited by fjh

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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. 

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

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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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it is very possible the relay box is bad. 

is it a small electronic control box, or the large old fashioned relay box?

 

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both wires should rest on ground then when you activate the switch it puts power to one side or the other. you should have a good solid ground on both motor wires when the switch is off. 

Edited by Ezrider

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