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I can't find my earlier posts on this... Every once in a while, the truck would not more than grunt. I'm only using it intermittently every couple of weeks. I have a 1.8A solar trickler on the dash into the always on lighter plug. The thing is, a hour on charge or a jump will fire it right up. The batteries don't seem to take much charging to spin it over. My first thought is dirty connections. We caught a nice warm day yesterday & I cleaned all the battery terminals with wire brushes. They weren't really bad as I have the treated felt washers under them all. I did see a spot on one that just looked a bit oxidized. I found one terminal (Pos on Driver's side)... I backed off the nuts first... and the terminal seemed to come off easier than the others. Hopefully this is it. It's been a couple of years since I had the batteries replaced at Sears & I've not had them apart since. Possible that the best cleaning job wasn't done then. There might be other connections that need service... I suppose the batteries might be failing though these incidents have happened in warm & cool weather. To top it all, the LED has failed in my solar trickler... It's still putting out power, but without a tell-tale... not convenient to verify correct operation. I'm looking at replacing it with a bigger solar charger but they seem to require a diode & regulator... I started it with a 6A charger after an hour, brought it up to the door for me to work on... cleaned the terminals & ;eft a tiny float charger on overnight. It started right up this morning & I took it for a ride to charge up. Passed the test... but intermittents can do that.