I have had my Mobile Mule DVR installed for some time and it works great. When installing it, I originally was going to have it turned on when the van was running. I had a picked out an “Engine Run” soft ground signal from the High Specification Vehicle Interface Connector. Between originally installing the front console switches and implementing the engine run enable, I decided to also change the power source based on the engine run signal. The goal was to have the front controlled power come via the transit while running.
The initial installation did not go well as the power was always on. My manual controll front switch still worked and I put the issue on the back burner as there was camping to be done and other things rose above the priority line.
I finally got around looking into the issue, and dug out the drawings above, I tracked the always on condition to be from my engine run signal. It was grounded all times. I thought maybe I has shorted out the wire. Nope, it was just bad at the High Specification Vehicle Interface Connector. Not wanting to go back into the Ford connector I decided to use my existing “Engine Run” signal that I use for my Wakespeed enable. This was already wired into a switch for my overhead console.
The original control was supposed to be a soft ground, but now it was a 12-volt signal. I had to solid ground the ground input of the relay coil and remove the power side from direct 12-volts and instead tap it into the Engine Run wire. Luckily, I only needed to run a wire from the overhead console down the windshield pillar and connect to the existing line that I had run for the previous High Specification Vehicle Interface Connector connection. I used a PosiTap at the Wakespeed switch.
All is working great now, and though the power draw is low, it now is being powered by the transit system while driving. This also enabled me to monitor the “engine run” signal in my Transit Status program. Now if the engine is running and the shore power is plugged in, I have a warning screen come up on my console screen. (this only works if there is active power to the shore power plug)
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