MicroSquirt.com read only forum (Jan.15,2018)

I was checking carefully the Relay Board schematic and the Microsquirt to RB schematic as I was about to connect the two together. The Microsquirt to RB conection schematic shows INJ2 connecting to PINS 35/36 of the DB 37. But the RB schematic shows pin 36 connecting to S5/11 on the term block. I verified that the RB schematic was correct using a continuity tester on my RB. So the connections to PIN 32 and PIN 35 on the DB 37 in the Microsquirt to RB connection schematic should be reversed unless I'm missing something somehow. Connecting as it is in the schematic could cause both banks of injectors to fire when the INJ2 bank fires.

I noticed this because I was considering alternate uses for S1-S5 in my application.

obxer wrote:So the connections to PIN 32 and PIN 35 on the DB 37 in the Microsquirt to RB connection schematic should be reversed

Oops - said this wrong - all the injector connections need to be moved to the next lower PIN# (shifted one pin to the left) so INJ1 is connected to PINs 32/33 and INJ2 is connected to PINs 34/35. PIN 36 wouldn't be used unless you want to connect something to S5 on the terminal screw block.

Third times the charm?

Now that I'm done I noticed something else. The positions and colors for INJ2 and INJ1 on the Microsquirt to RB schematic are reversed too. So you not only need to shift all the wires one pin positon you need to reverse the relative positions of the green and blue wires. Bottom line - pay attention to the RB schematic for connecting INJ1 and INJ2 and S5.

OK, I'm done now