light switch power source?
Moderators: Cal_Gary, T. Highway, Monkey Man, robi
light switch power source?
Is the light switch powered direct from battery or ignition?
'54 M37 wew
MVPA #16921
MVPA #16921
Re: light switch power source?
I'm not an expert since I run the Painless Performance harness; however, I believe ignition as I don't recall any secondary wires running out of the battery box.
I know that headlight switch harness is complex as the switch has the options to power off all your lights, go to service drive, or switch to BO mode.
Gary
I know that headlight switch harness is complex as the switch has the options to power off all your lights, go to service drive, or switch to BO mode.
Gary
Cal_Gary
1954 M37 W/W
MVPA Correspondent #28500
1954 M37 W/W
MVPA Correspondent #28500
Re: light switch power source?
The light switch normally works whether the ignition is on or not.
Per the wiring diagram:
Wire 82 is the battery cable running from the battery to the starter,
From that same terminal on the starter, wire 4 runs to the voltage regulator.
Wire 10 runs from the voltage regulator to the circuit breaker
Wire 11 feeds all the circuit breakers and he ignition switch
Wire 15 leads from one of the circuit breakers to feed power to the light switch
So all of the circuit breakers, including the lights, get their feed from the same place as the ignition switch. Unlike most modern vehicles, their power is not dependent in any way on the position of the ignition switch.
I can dig up a wiring diagram, if that would be helpful. M37B1 is a little different than the M37, but the part described above is he same.
Per the wiring diagram:
Wire 82 is the battery cable running from the battery to the starter,
From that same terminal on the starter, wire 4 runs to the voltage regulator.
Wire 10 runs from the voltage regulator to the circuit breaker
Wire 11 feeds all the circuit breakers and he ignition switch
Wire 15 leads from one of the circuit breakers to feed power to the light switch
So all of the circuit breakers, including the lights, get their feed from the same place as the ignition switch. Unlike most modern vehicles, their power is not dependent in any way on the position of the ignition switch.
I can dig up a wiring diagram, if that would be helpful. M37B1 is a little different than the M37, but the part described above is he same.
Last edited by John Mc on Thu Aug 26, 2021 7:01 pm, edited 1 time in total.
1951 M37 "Brutus" w/Winch and 251 engine
Re: light switch power source?
Correct, they are in parallel.