Zerostart 3200004 Lower Radiator Hose Heater - 1-3/4" Hose, CSA Approved, 120V 600W Engine Block Heater for Winter Car Warm-Up & Cold Weather Protection

I just finished the installation of this product on my 00 Wrangler TJ. The installation was mostly uneventful. I did notice an issue with the cord that connects to the heater element though. After finishing my installation I plugged the heater in and it did not work. After refilling the radiator with coolant I was not in a particular hurry to drain it again and disassemble / troubleshoot. After some wiggling of the cord with the heater on the vehicle I noticed that the female spade connectors---in the adapter that attaches to the heater--- were not widened enough during manufacturing. I had to use a flat head screwdriver to widen the plastic that was pinching the spade connector to allow the adapter to seat properly. After plugging it back in, everything worked. Time will tell how effective this is, but with single digit temperatures arriving in New England tomorrow, I expect to find out soon.Oh and a word of caution. Electrocution hazard. Unplug the cord from the power outlet before messing with the adapter that attaches to the heater. You stand an extremely strong chance of getting zapped, the leads are exposed in the cord and they connect via friction alone. Use zip ties liberally to keep that thing in place once you have it installed!------------Almost a year later... After a summer, multiple car-washes and a few thousand miles the ZeroStart is still performing admirably. I plugged the Jeep in for the first time last week and the ZeroStart sprung back to life without incident. Other thoughts after a year. Get a timer or some other method of remotely turning this on. I have mine hooked to a zigbee switch and can toggle the product remotely without having to mess with the plug in the garage or on the Jeep. This saves electricity and also tracks usage.