1985 Yamaha 115 all electronics dead at engine

[ProCharger]

I did a search and came up empty finding a similar problem. I recentlly brought my boat home out of storage, boat wasn't ran for 2 years. I put the muffs on it, primed the fuel, and started right up idling for a few minutes with the muffs on. I shut it down because the impeller indicator was sputtering the water instead of a full stream, no big deal as I was going to buy a repair kit and change it anyways. I blew out the hose and then hooked it back up to start it again to see if maybe there was an obstruction. Turned the key and nothing. Everything was dead. All guages on the dash of the boat work, bilge, aerators, etc. all worked but I can get nothing from the engine. Trim, electronic choke, basically everything that has to do with the engine is dead. Are there some fuses that I might be missing? I checked the fuse under what looks like a cover for a relay and it was fine, has a 20A in it. That is the only fuse I could find. On the passanger side of the engine there looks to be 3 sets of relays mounted vertically that are in series, all 3 have power to the positive side. Checked all of the connections and I am at a total loss for what is wrong. Anyone have any ideas what the culprit could be? Relays? I was thinking a ground issue but I can not find anything out of place. Thanks in advance.

Brett

ETA: Controls at the drivers seat as well as controls at the engine itself are nonfunctioning including the power trim on the engines side.

 

[crb478]

Re: 1985 Yamaha 115 all electronics dead at engine

Check your switch

 

[ChrisWilliams]

Re: 1985 Yamaha 115 all electronics dead at engine

Yes, check for power to your switch, then work back to the 10 pin connector on your motor. The blue power pin, female side can corode off and cause this.

 

[ProCharger]

Re: 1985 Yamaha 115 all electronics dead at engine

Would the switch cause the trim to be dead as well using the trim button located on the side of the engine itself? I am assuming you mean the switch for the key with the drivers controls? I will see what I can come up with. Thanks for the reply.

 

[ChrisWilliams]

Re: 1985 Yamaha 115 all electronics dead at engine

I would have to look at a wiring diagram to be sure. That is why I said start there and work backwards. You could start at the 10 pin connector on the motor in the main harness. Light blue should be 12v. Never know, could be multiple problems.

 

[ProCharger]

Re: 1985 Yamaha 115 all electronics dead at engine

Update: Tonight I was messing around with it with no progress (pretty sure my neighbors multimeter is FUBAR) and I had left the key on. I didn't notice until I went outside when it was dark to move my work truck on the driveway, the green oil light and trim guage were lit up on the dash. I went ahead and tried to crank it and when I did I heard a small click come from the engine and then the dash lights went out. Not sure if that helps or not but I figure it couldn't hurt to mention. I will be buying a new multimeter probably tomorrow so I can do a little better trouble shooting.

 

[99yam40]

Re: 1985 Yamaha 115 all electronics dead at engine

Sounds like battery cable connections or cable its self

 

[ProCharger]

Re: 1985 Yamaha 115 all electronics dead at engine

I took the switch apart tonight and did a little messing around with it. I am unsure of what color is suppose to do what though so that has me at a standstill. Does anyone know or can you point me in the direction of the proper wiring for the switch. I have a red, brown, white, yellow, and 2 black wires on the switch itself and not sure when they are suppose to have power (what position on the key).

I did put the switch into the run position and then used a jumper cable to the starter from the battery and within 4 seconds of cranking the engine was running. I let it run for about a minute then turned the key to "off" and it worked fineshutting it off. While the engine was running the trim was still dead and when I tried to restart after turning it off everything was dead again.

Thanks for the replies.