So I wanted to gain some skill before taking my MS out of the box and I'm glad I did. this was a learning experience right away. There are no obvious signs of why it failed. The only thing I can think of is I burned the LEDs out while soldering...?

I got no response on MSextra. So ill try here.

How I tested the LEDs (per the instructions)

I connected the 3.3v pin header to the 3 pin header (directly across from the word tach on the 19 pin header). Using the 1st pin from the left.

I connected the 3 pin ground header at the very bottom left of the board to the first pin (closest to the injector LEDs) of the 10-pin LED header.

I then turned the switch to ON. Nothing happens in either direction. (I'm using a brand new 9v battery). The LED directly next to the switch does NOT light up.

When I move the jumper wire from the 1st pin on the 10 pin header to the 2nd pin just below it, the 2nd IGN LED lights up.

moving on down the line only moving the jumper wire down the 10 pin header.

The 3rd header pin does nothing.
The 4th pin does nothing.
The 5th pin lights up the IGN 5 LED.
The 6th pin lights up the IGN 6 LED.

leaving everything the same and moving the wire jumper that is connected to the ground to the 19 pin header starting at the top, closest to the INJ LEDs.

FP - Lights the FP LED
IGN - Nothing
INJ2 - Lights the IGN2 LED
INJ1 - Nothing
I2B - Nothing
FIDL - Lights the FIDL LED


Moving to the 7th pin header from the top, to test the IAC LEDs. I move the jumper wire from the 3.3v single header to the 3 pin header to the left of it (12v). Then keeping one end of the jumper wire on the grounded 3 pin header to the 8th pin from the top on the 10 pin header. IAC1 lights up. Moving the header on the 8th pin to the 9th and 10th does nothing.



So i'm lost. some work and some do not.... My solder joints look good. everything is in the right place on the board. What could be the problem?

I can post pics of exactly what I am doing if this would be less confusing.....?


Following the Tach Signal instructions, While turning the RPM pots, both adjust the IAC2 light. So I am assuming this area has no problems.

Unless both or IAC LEDs are supposed to blink?

 

Have you connected it to a working MS yet?

 

The question is unclear...The Stim is connected to a 'Squirt, right? They get their 5V from the 5V reference on the 'Squirt mainboard.

 

I have not connected it to a Megasquirt yet. I was only testing to see 8f I assembled the JimStim correctly.

I'm fixing it now. I'm fairly certain I put (the non working) LEDS in backwards. I didn't notice at first they had a specific orientation.

 

Ah, that will do it!

Don't feel bad. I haven't assembled a circuit from scratch in a few years so when I did about a month ago, I put the LM78L05 regulator in backwards. Puff of smoke, no 5V. Luckily I had a bag of spares.