jeepguy553

Sorry for the cross-post. I am having a beotch of a time getting this fixed.
Has anyone else used an Accel 300+ ignition on a TBI engine? If so, I need a little help wiring it up. This is becoming a large PITA and is the very last part I need to fix before I can fire the whole thing off. I have the universal kit and harness. Summit told me I needed a harness with P/N 49122 for almost $70.
Basically, I need a diagram of the harness used with a GM small cap dizzy. Summit told me in one breath to wire the mag pickup ORANGE to the white points/amp pickup...then turned around and told me to send the coil output voltage (600VDC) to the in-cap module. That made NO SENSE at all and would probably blow something up.
HELP PLEASE!!!
TIA...

jeepguy553

I don't have a photo, but here are the pinouts for the Accel 300+.
Flat connector:
1.) Red wire to switched 12VDC
2.) Black wire to ground
3.) Yellow to coil +
4.) Brown to coil -

Square connector (looks like an IAC connector in reverse)
1.) Orange wire to mag pickup -
2.) Purple wire to mag pickup +
3.) White wire for points/amp trigger (has 12VDC with IGN in RUN)
4.) Green to tach

I have talked to Summit and they basically can't help me. The way to approach this AFAICT is to pretend that I am actually using a small cap dizzy since that is the EST I am using. If you look up at the edit to the first post, you'll see that the Summit tech rep genuinely tried to help. At first he said to wire the Orange to the white and the purple to black (GND). Then he said to wire the coil out puts to the + and C terminals on the module. That would have sent nearly 600VDC to the in-cap module!
Thanks...

TRAXION

There's a specific plug and play adapter harness ....

http://www.mrgasket.com/accelpdf/GMsmallcap.pdf

Not DIY-PROM Related so I have to move to another forum.

Tim

jeepguy553

Yeah...I know. Summit wanted $70 for it. I ordered it and then decided I could cobble it together myself with a little help...so I canceled the order and used the $$ for some other stuff I needed. This sux...

Dave Y

ok, you just need to work with the wires at the coil

coil has 4 (or 3) wires to it, 2 white and 2 red/pink

the plugs have 1 of each color

the plug that goes between the distributor and coil , the white is the - pickup/coil ground wire, the red is 12v to the dist., the other plug(from harness to dist.) the white is the tach wire(to gage) and the red is 12v to power coil(and dist. through coil)

jeepguy553

Dave, if you ever find yourself in Corpus Christi, TX...look me up and I'll get you a few beers! That is pretty much EXACTLY what I needed! Thanks a million!
So, the white wire is essentially the trigger. Once the EST breaks the ground to the EST, the saturated coil voltage has nowhere else to go but to the spark plug (the "NEW" ground path). If I use the white wire off the Accel 300+ as a trigger (points/amplifier trigger) it will work the same as originally intended with the Accel box providing the coil primary voltage in place of the +12V that comes from the IGN circuit. There would be no reason to hook up the MAG PICKUP (ORN and PUR) from the Accel box, right?

jeepguy553

How's this for a diagram of the harness? It still doesn't give any clue as to what to do with the GREEN TACH wire from the Accel box. I am reluctant to send it to the ECM as it carries a full 12V square wave signal at a 20% duty cycle.

jeepguy553

OOPS...forgot to attach the pic.