Posted: 9/3/2011 5:30:39 PM EDT
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I originally posted in team and had no clue there was a forum like this on here so I will just copy and paste what I have so far.
_____________________________________________________________________________________________________________ I posted on iboats.com and still working on it but I will copy and paste what I posted there. BTW I had no freakin clue we had a boating forum! I will have to cross this thread over there. Thanks. Original post: 1985 Yamaha 115 all electronics dead at engine 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. Post 2: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. Post 3: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. |
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From your second post it sounds like the battery is just dead. The three relays you mentioned are the trim up, trim down and starter slave relay. You may be fighting two separate issues also. Put a known good battery in it to eliminate that. Then try "wiggling" the shifter/throttle forward and back. There is a small switch inside the control box called a neutral safety switch. If it sticks in the wrong position, the engine won't crank, or shouldn't if it's working right. Also check the safety lanyard kill switch. Operate it several times. It may have some corrosion in it.
As we aren't a Yamaha dealer, I don't have access to the wiring codes. Yamaha (and the other Asian engines) don't follow standard wiring color codes. I do think the brown wire is the positive to trigger the starter relay though. Since it's been sitting so long, check all the connections for the battery and grounds. Loosen them and re-tighten. The control harness is suspect too. Take the connector apart and re-assemble a few times.. report back. KB 
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Quoted:
I too was skeptical of the battery so I put a different battery on it as well as jumper cables from my truck while running to make sure it was getting full power so I think I eliminated battery. I cna also jump the relays and the trim (up and down) as well as starter work. When I jumped the starter last night I only used the battery hooked to the engine and it started right up.
From your second post it sounds like the battery is just dead. The three relays you mentioned are the trim up, trim down and starter slave relay. You may be fighting two separate issues also. Put a known good battery in it to eliminate that. Then try "wiggling" the shifter/throttle forward and back. There is a small switch inside the control box called a neutral safety switch. If it sticks in the wrong position, the engine won't crank, or shouldn't if it's working right. Also check the safety lanyard kill switch. Operate it several times. It may have some corrosion in it. As we aren't a Yamaha dealer, I don't have access to the wiring codes. Yamaha (and the other Asian engines) don't follow standard wiring color codes. I do think the brown wire is the positive to trigger the starter relay though. Since it's been sitting so long, check all the connections for the battery and grounds. Loosen them and re-tighten. The control harness is suspect too. Take the connector apart and re-assemble a few times.. report back. KB I would imagine the safety lanyard is ok since I was able to start and keep the engine running by putting the key in run and jumping the starter from the battery. If it wasn't working properly I would think it would just crank and not start. That sound correct? I checked the shifter last night and there was a noticable click when operating the shifter. Sounded ok but the part that has me so confused is the trim and electronic choke are not working as well which should operate with the key turned off in or out of gear. I also disconnected and reconnected all connectors/harnesses I could find. I am no marine mechanic but here is what I come up with...tell me if this sounds right. The cables from the battery to the engine itself are fine, I get good power on everything at the engine on the multimeter, I get sufficient power to jump the starter from the battery side of the relay to the starter side of the relay, cranks a few times and runs. The 3 relays wired in series show good power and I can jump the relays and trim the engine as well. There has to be a power problem somewhere on the power cables running to the front or from the front back to the engine, could be a power issue but to me it seems more like a ground as it's effecting all power running through the shifter/switch unless there is a master power not working which is why I am looking for a wiring diagram or information. I am assuming the trim button mounted on the side of the engine is also wired in this same line as it's the only part on the engine that is not getting power. The three relays mounted on the engine are not getting the trigger power they are suppose to, that is the part that I can not figure out, where the break is at. Thanks. |
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Quoted:
Quoted:
I too was skeptical of the battery so I put a different battery on it as well as jumper cables from my truck while running to make sure it was getting full power so I think I eliminated battery. I cna also jump the relays and the trim (up and down) as well as starter work. When I jumped the starter last night I only used the battery hooked to the engine and it started right up.
From your second post it sounds like the battery is just dead. The three relays you mentioned are the trim up, trim down and starter slave relay. You may be fighting two separate issues also. Put a known good battery in it to eliminate that. Then try "wiggling" the shifter/throttle forward and back. There is a small switch inside the control box called a neutral safety switch. If it sticks in the wrong position, the engine won't crank, or shouldn't if it's working right. Also check the safety lanyard kill switch. Operate it several times. It may have some corrosion in it. As we aren't a Yamaha dealer, I don't have access to the wiring codes. Yamaha (and the other Asian engines) don't follow standard wiring color codes. I do think the brown wire is the positive to trigger the starter relay though. Since it's been sitting so long, check all the connections for the battery and grounds. Loosen them and re-tighten. The control harness is suspect too. Take the connector apart and re-assemble a few times.. report back. KB I would imagine the safety lanyard is ok since I was able to start and keep the engine running by putting the key in run and jumping the starter from the battery. If it wasn't working properly I would think it would just crank and not start. That sound correct? I checked the shifter last night and there was a noticable click when operating the shifter. Sounded ok but the part that has me so confused is the trim and electronic choke are not working as well which should operate with the key turned off in or out of gear. I also disconnected and reconnected all connectors/harnesses I could find. I am no marine mechanic but here is what I come up with...tell me if this sounds right. The cables from the battery to the engine itself are fine, I get good power on everything at the engine on the multimeter, I get sufficient power to jump the starter from the battery side of the relay to the starter side of the relay, cranks a few times and runs. The 3 relays wired in series show good power and I can jump the relays and trim the engine as well. There has to be a power problem somewhere on the power cables running to the front or from the front back to the engine, could be a power issue but to me it seems more like a ground as it's effecting all power running through the shifter/switch unless there is a master power not working which is why I am looking for a wiring diagram or information. I am assuming the trim button mounted on the side of the engine is also wired in this same line as it's the only part on the engine that is not getting power. The three relays mounted on the engine are not getting the trigger power they are suppose to, that is the part that I can not figure out, where the break is at. Thanks. Like I mentioned above, I'm not a Yamaha guy but I'll see if one of the guys at work have a Yamaha manual stashed away somewhere. I think you are on the right track. Every outboard I have seen runs low current 12v power through the wiring harness. This includes the trim switches and ignition switch. Even the trim switch on the engine cowling gets it's power that way. Most of the time all the gauges on the helm are powered from it too. I'll post up whatever I find tomorrow in the way of a manual or wiring diagram...yes, I have to work on Labor Day. 
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One of the guys had a Seloc manual for Yamaha, but it's 1997-2003. The wiring diagram for the '97 shows two fuses on the engine. A 20A and a 30A. In fact, all the V4's show two fuses. May hunt around a bit more for the "lost fuse". They can be tricky to find, but will be attached to a red wire according to the manual. It may be hidden inside one of those fancy white plastic "boxes" on the wiring harness.
Oh, and the brown wire is the start trigger wire..I got a mind like a steel trap.. 
ETA–– Quoted from your previous post. " I would imagine the safety lanyard is ok since I was able to start and keep the engine running by putting the key in run and jumping the starter from the battery. If it wasn't working properly I would think it would just crank and not start. That sound correct? " Yes. ETA –– reading is fundamental.. 
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