To Group,
   I’m trying to finish the wiring on my test
   stand and I have some concern about
   protecting the ECU. As per the instructions,
   the computer is connected to the primary
   buss which is protected by a 50A switch/
   breaker. I think this is too high for the
   ECU. Should there be a lower amp fuse
   between the buss and the ECU? If so,
   what rating? Thanks.
   Frank


   Definitely. Put something like 5 amps in there.
   It is switching the injectors but only pulses of an amp or two.

   Paul Lamar


Injectors are wired with 12v to them and the ECM side is the ground. ECM grounds to turn them on
It is a safety for the circuit board. A ground in the wiring to the injector pops a fuse. If the wire to the
ECM gets grounded, the injector is on all the time. Fuse or the injector fail. Both less expensive than
a new ECM. Sensors with 3 wires have a 5V, Grd, and sensor output wires. Sensor output is about 1V
to 5V. Circuit protected by the ECM internal supply. If more than the sensor volts comes back the board
will likely be toast. Current supply to the ECM is fairly low. There is the fuse for the main operation
and a keep alive circuit that has power at all times for memory of faults. Check your vehicle for the ECM
fuse. all should be about the same.

Dale Davies



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