Merc 502 EFI. Wiring diagram?

[CRay45DB]

2005 Merc 502's IO. Hi, spending this weekend in a nice pricey Marina. Problem started when I started the engines Friday, had a bad solenoid, so I by passed it and started right up. When I went to start it today, went to bypass it it got a bunch of sparks and nothing happened. So, now when I turn the ignition to on, fuel pump does not power up. I can jump and turn the engine over, but won't start. Took all of the relays in the control box and swapped them with the other engine. Obviously this got messed up, but by how much, don't know.

Next steps? Does the brain control the fuel pump when ignition is turned on?

Thanks

 

[figaro]

Re: Help, stuck in a very expensive Marina

Re: Help, stuck in a very expensive Marina

probably tripped a main breaker or burnt a main fuse link ,make model and year someone else maybe able to chime in

 

[CRay45DB]

Re: Help, stuck in a very expensive Marina

Re: Help, stuck in a very expensive Marina

2005 Fountain with 502's MERC EFI.

Looked at the fuses in the control box. Three of them, also one inline fuse next to the box.

 

[CRay45DB]

Re: Help, stuck in a very expensive Marina

Re: Help, stuck in a very expensive Marina

Anyone havea wiring diagram by chance?

 

[Don S]

Re: Merc 502 EFI. Wiring diagram?

I would guess you are trying to jump start it from the starter solenoid. You have a a square fuse (90A) on the starter solenoid that provides power to the rest of the engine. When you produced all those sparks, you blew the fuse.
Here is the wiring diagram for the starting system, It's item H in the drawing.
In the future when you want to jump the starter, best to jump the two large terminals on the slave solenoid (C in the drawing). Does the same thing.



You might want to look at this link for troubleshooting information http://forums.iboats.com/showthread.php?t=167035

 

[CRay45DB]

Re: Merc 502 EFI. Wiring diagram?

Thank you. That's what I was looking for! It's the 90!