I would of course, be sure that the car is turned off while switching...
going from input to no input, or partial input may cause issues (damage) to
the ecu, or the sensors (map or mas),,,, just a thought...

Bob in phx
"default" wrote in message
...
On 30 Sep 2005 06:12:00 -0700, "Coyoteboy"
wrote:

Is there any way, simply and cheaply, that i can find a physical switch
to swap between two wiring looms on an ECU for a car? Theres 52
individual channels (all 0-12v DC, no massive currents, some are noise
sensitive such as the knock sensor).

Any help appreciated.

Hold the phone . . . How about using switches? It would take (say)
three banks of roller arm or lever arm microswitches. Three banks
would be about four inches long each.

You could manually transfer the connections with a single lever that
would slide three bars against the switch arms compressing them and
actuating the switches.

If it needs to be under remote control, I'd use something like those
new "solenoids" that are appearing in cars. They are a motor driven
plunger with a high gear ratio and about a one inch travel. A lot of
torque . . . something most solenoids lack - and they don't require
power after switching.

A pair of extra switches in the banks could be used to limit the
travel of the plunger - like the "zero seeking" mechanism used in
windshield wipers. The switches have power applied to move plunger in
one direction or the other and it travels until it switches itself
off.

The whole switch assembly would take up about 4" X 4" X 1" excluding
actuator.

The same idea could be applied to these little 1/4" SPST snap action
board mounted "reset" switches. Two banks of 52 switches with a
mechanical either-or actuator.

My guess is the SPST switches would be cheaper ten cents versus a
dollar for a microswitch, but the mechanical actuator would be easier
with a microswitch.

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