Smelled a burning smell coming from 1 of my Honeywell T4700B 4 wire line voltage electric heat thermostats(electronic). Pulled it out and found 1 of the neutral wires melted at the wire nut. Although burned and melted wire was still connected inside wire
in the closet hung unit with strapping material and connected to the gas line, vents and air conditioning line set fired unit . unit was working ...
identification, electrical system fundamentals, tools, measuring, TROUBLESHOOTING, water damage, starting the engine, poor engine performance ...
Here you can see what the installation looks like. The battery pack is now in 2 battery boxes, one under the hood and one in the bed. Unfortunately, there was not enough room between the frame rails to put the new rear battery box under the floor. I hated to lose the space in the bed! Anyway, the boxes are of plywood painted with aluminum paint. I ordered parts to build a control to turn off my DC/DC when the pack voltage was high (like when charging) from a company called Master Distributors. Pieces are dribbling in. Worst run supplier I have run into. I have hopes that the last two relays will show up soon. They already told me that they "couldn't find" the listed as in stock fan I ordered. They seem to have mastered getting to the top of Google listing, but they are still working on fulfillment. Not recommended!! These batteries put out a lot of heat toward the end of charge. Discharge doesn't seem to produce as much. I planned to modify an indoor/outdoor thermometer to handle 2 remote sensors, but I seem to have destroyed it. I got a unit with a wireless connection which works well for monitoring one box. Serendipitously, I can monitor the temperature from inside the house while she charges in the garage. An electronic thermostat was recommended to control the pump, but I was not happy with its operation. I pulled a bimetallic thermostat from an old space heater and mounted it on a piece of sheet metal. It is designed to turn off 110v, and I want it to turn on 12v. I wired it up to a 12v automotive relay. Connecting the pump to the normally closed contact on the relay keeps the amperage through the thermostat so low that the 12v arcing is insignificant and when the thermostat is closed the pump is off. When the thermostat gets hot it opens and the pump is turned on. I have driven it on several trips, one over 15 miles, and it is working well. I keep a wary eye on the thermometers, but they have stayed under 90. Charging is another matter. My charger is programmed...
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