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Old 06-09-2016, 10:57 AM   #11
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Join Date: Jun 2013
Location: Brazoria County, Texas
Posts: 1,265
I've replaced two jacks due to water intrusion...well, one was a switch replacement. The first seized the motor, the second corroded the switch contacts. At first, it would work intermittently. The wires finally broke completely off. If it's not the ground, look at the switch.

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Old 06-09-2016, 11:09 AM   #12
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Join Date: Mar 2008
Location: Southwest Alabama
Posts: 3,309
A lot of jacks use the flange to tongue connection for the ground. It's usually a good idea to grind the paint off at least one of the mounting holes on the flange and tongue and then apply a little dielectric grease to prevent rust and then remount the jack. I personally grind the paint off around all the mounting holes, just to be safe.

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Old 06-09-2016, 11:52 AM   #13
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Join Date: Aug 2011
Location: Albany, GA.
Posts: 599
Two days may have been enough to charge the battery as to where the jack would work. The wire coming out of the jack is the positive (+) or "hot" wire and should go straight to the (+) terminal of the battery. The jack receives it's "ground", or negative (-) via the bolts holding the jack to the frame. That's why it is so important to have a good ground for the jack to work properly. Find the negative, or (-) terminal on your battery. IF there are more than one wire on the negative (-) terminal then trace the larger wire back to where it connects to the frame in some manner. That connection to the frame is very important. A lot of times the employee(s) at the factory will just shoot a self-tapping screw through the lug on the ground cable into the frame. That IS NOT a good connection. Most frames have a heavy coating of a black paint material on them so the only connection you really have is through the threads of the screw and the frame. I like to scratch off/remove the paint where the ground lug attaches so that the lug on the ground cable will make good metal-to-metal contact with the frame. That way I'm assured that there is a flow of electricity through the metal of the frame to where the bolts for the tongue jack go into the frame. After removing some paint from the frame, then securing the ground cable lug to the frame I like to spray that area with an undercoating material in a spray can, available at most auto parts stores. This prevents any rust from forming between the ground cable lug and the bare frame. Another good idea is to remove some of the paint from underneath one or more of the bolts holding the jack to the frame, this gives good contact between this bare metal area and the internal star washers under the bolt heads.

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