Fixing a long standing problem.
Big battery charger/booster is a great unit and I don't use it that much, but when you need it, it can save the day. The only grip I have ever had about it is the really lousy plastic insulated wires. Sure they are soft in a warm store, but outside when you actually use it, they are stiff and brittle. The power cord was broken at both ends and more wraps of electrical tape was just kicking the can down the road....
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Time for a replacement. The next one would be rubber insulated and 14 ga instead of 16 ga. Straight forward repair. But at the same time I wanted to replace the battery cables. They were not broken but were sure hard to deal with in the cold.
The other grip I had is that all the cords came out of the back of the machine and the handle was not big enough to wrap them all up so something was always dangling and in the way of putting the charge on and off the shelf where it is stored. First step was to find suitable cables. The local farm store carries welding cable in bulk, sold by the foot. Yay! Decided to upgrade from # 4 wire to #2. Added benefit is the welding cable is super flexible and oil resistant and abrasion tough.
Finding welding cable got me to thinking about how they are connected to welders. Quick Connects! None of the local welding stores had then in stock so web shopping it was. Sender sent them to the wrong address but eventually they showed up and were exactly what was needed.
Internally I had to move the big circuit breaker so there are now two new screw heads showing on the front face but the sockets fit nicely and didn't even cover up any important labels. I even managed to salvage and re-use the original battery clamps. It was a little difficult getting the bigger wire crimped properly but it all worked out well enough that the original plastic handles went back on with a little help from the heat gun.
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All that was left to do is replace the crappy stamped steel nut that holds the switch to the panel. It had come lose a couple of times as it only engaged one thread of the plastic switch. Digging through my scrap bin, there was the head off of a brass bolt and I actually had the odd-ball 7/16 fine thread tap! Lathe to the rescue and in less time than it would take to drive to a store, I had a bigger better brass nut that used all the threads of the switch barrel. A nice carry sack to store the cables in and put on the shelf next to the charger. No more dragging dangling cables!
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Now that it is all ready to go, it will probably be a couple of years before I need it again.
Cheap insurance against dead batteries in cold...