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Do Not Touch The Trim!
Joined: Thu Oct 19th, 2017
Location: USA
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basically i want to switch on a relay whenever the expo is running but not when the key is on or not running. this will control my battery isolator solenoid (basically a huge 500a relay, but it draws 8a so i want to use a smaller relay to trigger the solenoid)
this will charge both batteries when running & the alternator is charging, but keep the batteries separated when off or if i want to listen to the stereo with the vehicle off.
the voltage controlled relays i got should do what i'm trying to do.
if i set the turn on voltage at around 13.5v it should kick on the isolator when the alternator chaarges the battery & by setting the turn off voltage at around 12.8v it should turn off a few seconds after it's shut off & the battery returns to resting voltage.
i'll probably have to play with the on/off adjustments until i get everything dialed in.
as a bonus, i found the voltage sensing relay modules have a "force on" connection where i can install a switch somewhere in the cabin should the main battery ever go down & not start, i can connect the aux battery for a quick boost.
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1996 XLT Supercab 4.0L 4x4
Lots of Explorer parts & tons of my custom mods.