Installing a used EFI system on a previously carbed 502. Everything is working correctly as far as fuel pressure, spark, etc. with the exception of injector pulse. We have checked to make sure the computer is good on another boat, we can probe the harness at the dizzy and get the injectors to fire, but can't seem to get them to hit while we turn the motor over. We have the pictures connector left with no where to plug in, does some thing on it need to be jumped or connected? [ATTACH=CONFIG]561500[/ATTACH]

What are you doing for Crank position sensor

No Cps on this unit

Is the power to the injector stay on when cranking?

Zero power to injectors, fuel pump is good, relay isn't sending power down small pink wire from relay. But if back proved through the purple/white from back of dizzy injectors fire, but won't stop firing until you try to crank it, then they stop and won't start up again

Any other ideas?

There is no quick question with boats, lol. Don't you need an efi cam if this is a stock merc system?

2003 system....don't think it's got cam position sensor

I would think it would need something to tell it when to send a signal to the injectors. Cam or crank sensor.

You haven't mentioned if OE Mercury fuel injection or not, but if Mercruiser, have you looked at wiring diagrams ?

http://www.boatfix.com/merc/Techbk/96/96HGD4.PDF