2011 Crownline 18SS Issues

[Twainer]

I was doing some PM's on the boat. Oil change, gearlube change, cleaned spark arrester, & new distributer cap. After I finished, I wanted to run it to make sure lube levels were good. Turned the key... nothing. Turned it back & forth a couple more times than the ignition switch turned farther than it should & then had trouble getting it to go back to off & get key out. I went ahead & ordered a new switch. It won't be here for a few days so I was considering hot wiring it to be able to use it over the 4th holiday. This didn't work either. I started taking voltage readings & found I do not have 12V coming to the ignition switch. 30 amp fuse back by the battery good, the 50amp breaker on top of the engine good, the 20 amp fuse up by the switch good but noticed no 12V on either side of the fuse leads. What else have I missed? It's like I bumped something or tripped a fuse, but I can't seem to find it.
Thanks for stopping by & reading...

 

[Twainer]

I was doing some PM's on the boat. Oil change, gearlube change, cleaned spark arrester, & new distributer cap. After I finished, I wanted to run it to make sure lube levels were good. Turned the key... nothing. Turned it back & forth a couple more times than the ignition switch turned farther than it should & then had trouble getting it to go back to off & get key out. I went ahead & ordered a new switch. It won't be here for a few days so I was considering hot wiring it to be able to use it over the 4th holiday. This didn't work either. I started taking voltage readings & found I do not have 12V coming to the ignition switch. 30 amp fuse back by the battery good, the 50amp breaker on top of the engine good, the 20 amp fuse up by the switch good but noticed no 12V on either side of the fuse leads. What else have I missed? It's like I bumped something or tripped a fuse, but I can't seem to find it.
Thanks for stopping by & reading...

 

[alldodge]

Merged 2 of your threads, and deleted the 3rd.

First of all what motor, assuming Merc

Trace the 12V starter post to key
Starter post to 90 amp fuse (its on the post)
90 amp to 50 amp breaker
50 amp breaker to engine connector pin 6 red/purple
Pin 6 to ignition fuse/breaker (either behind helm of breaker panel)
fuse/breaker to key

 

[Twainer]

Merged 2 of your threads, and deleted the 3rd.

First of all what motor, assuming Merc

Trace the 12V starter post to key
Starter post to 90 amp fuse (its on the post)
90 amp to 50 amp breaker
50 amp breaker to engine connector pin 6 red/purple
Pin 6 to ignition fuse/breaker (either behind helm of breaker panel)
fuse/breaker to key

Thanks for fixing the thread. 4.3L Merc

 

[Twainer]

Merged 2 of your threads, and deleted the 3rd.

First of all what motor, assuming Merc

Trace the 12V starter post to key
Starter post to 90 amp fuse (its on the post)
90 amp to 50 amp breaker
50 amp breaker to engine connector pin 6 red/purple
Pin 6 to ignition fuse/breaker (either behind helm of breaker panel)
fuse/breaker to key

Shouldn’t I at least be getting 12v to the key before starting those tests? I am not sure where that 10-12 gauge red wire goes after it goes up into the wire loom. I assume that is where my 12v comes in to the ignition switch. There is another red wire about that size that goes to the fuse block under the dash but I think the two are separate. And I do have 12v at the fuse block. We are camping now without it so I will do some more voltage checks when we return home. Just seems weird that this all happened after changing oil. When I warmed the engine up it started just fine. Really feel like I bumped something or the ignition switch blew a fuse that I can’t find.

 

[alldodge]

Red is 12V unfused 10 ga
Red/Purple is 12V fused 10 ga

Pic shows circuit to crank the motor over
The run circuit uses a purple wire from the key which is not shown

 

[Twainer]

This looks very much like my setup. It’s actually a 4 pole ignition switch. 10g red on Battery, 3 purple on the ignition, red/yellow on starter, and 2 smaller red off the auxiliary. I have checked just about everything in that picture except the 90amp on the starter solenoid. I will start there when I get back home and work my way back to the ignition switch. If it is the 90amp fuse where does a guy get one of those? Parts store or special order online? Thanks you so much for your help. Hope you have a great 4th!

 

[nola mike]

Do you have 12v at the cannon plug? That connection can cause problems

 

[alldodge]

If it is the 90amp fuse where does a guy get one of those? Parts store or special order online?

If it is blown, just search for 90 mercruiser fuse.
The fuse is inside the cube and can be remove/replaced

 

[Twainer]

If it is blown, just search for 90 mercruiser fuse.
The fuse is inside the cube and can be remove/replaced

The 90amp fuse was indeed blown. I have ordered one which should be here around Friday. Already have the new ignition switch & have it wired in. Since the key switch wasn't working properly, I am assuming it shorted itself out causing this fuse to blow. I will know more after I get it all installed. Thanks all for your help. I started my voltage tests from the wrong end (key switch back) & I didn't realize there was a fuse on top of the starter.