350 MPI Engine won't turn over . Dead in driveway

[Captain Michael]

I had to replace my fuel cooler on my 2005 Kayot with a 350 Mercury MPI. I inadvertently reversed the alternator wires when reinstalling. Now I do not get two beeps when I first turn key and starter won't engage. I still get accessories , fan and pump power. I have checked numerous fuses but can't find any blown. I hope I did not fry ECM ?

 

[alldodge]

When key is turned do the gauges come alive?
If they don't look for the 20 amp ignition fuse on the red/purple wire coming from the key switch

If they do and the 20 amp is good, there are 3 fuses on the top the motor,
If top motor fuses are good, then it probably is the ECM

You code contact Bob and see if he can assist
https://obd2allinone.com/

 

[Captain Michael]

Gauges do not come on. I will check the ignition fuse tonight. Is it located under dash ? It is very tight quarters under there. Thanks

 

[alldodge]

Gauges do not come on. I will check the ignition fuse tonight. Is it located under dash ? It is very tight quarters under there. Thanks

Its either in the fuse/breaker panel and would be labeled. Or follow the Red/Purple wire going to the key switch

I said above the purple wire above (have fixed) but its the Red/Purple

 

[Bt Doctur]

Test the alt output lead for 12v ,if not you have the 90a fuse link at the starter, its blown

 

[Captain Michael]

The 90 amp fuse was blown. I did that when reinstalling alternator. Thank you Bt Doctur and all dodge. Now I think I have to remove fuel filter and add some gas to cooler chamber as it turns over now but will not start.

 

[alldodge]

I hope that is all it takes, most cases reversing the leads causes the ECM to take a hit