TPMS wiring

BB_TX wrote:
My tpms (TST 507RV) just plugs into a 12v outlet. And that is to charge the tpms battery. It will operate for hours unplugged. I usually leave it plugged in while traveling but leave it unplugged when not using it and it does not lose it settings, even after extended times unplugged.

X2

I have never seen a unit that loses the settings when unpowered and I really doubt one exists.

I would chalk it up to Chinglish.

My tpms (TST 507RV) just plugs into a 12v outlet. And that is to charge the tpms battery. It will operate for hours unplugged. I usually leave it plugged in while traveling but leave it unplugged when not using it and it does not lose it settings, even after extended times unplugged.

Yet another parasitic battery drain to contend with.. My 2010 F150 doesn't do well at all when the battery gets disconnected and all of the must stay-on items loss DC power. The last time I had to disconnect the start battery for something the on-board computer for fuel control lost its settings and my truck started dying at stop signs... Had to keep foot on the gas pedal every time it stopped at one. The book said it would relearn the setting but didn't happen for me. I ended up having to take it back to Ford to put on the machine there to reset the settings at a min cost of $90... Needless to say I jumper in a second battery now when I have to disconnect the main truck start battery.

Roy Ken

Thanks, that makes sense

The constant 12 volt is typically to keep your memory settings while the ignition is turned off.