I have a pair of 2003 Yamaha F115s. I took the boat out today and the starboard tach just reads zero. Tomorrow I'm going to dig into it and was wondering if someone on GG might know where the signal wire is under the cowl and what color it is. That would give me a place to start. I have the standard round gauges and the zero that shows when you turn on the key is all I get. Any help or hints is appreciated.
Yamaha tach not getting signal
- Thread starter Halfhitch
- Start date
If Command Link, the info comes over the CAN bus from the CDI (ECU). The ECU apparently get the signal from the
I found this posting about the same issue.
the tach send terminal can be checked using the AC meter function and a known good ground.
dark green is tach send,yellow is key on 12V and black is ground if the wireing harness is still yamaha.
tach send is generated by the ECU.
Also note that there are switches on the gauges that need to be set for the correct number of poles and engine type. You may want to note the settings and then flip the switches a few times in case the contacts are 'dirty' Settings are in the gauge manual.
I found this posting about the same issue.
the tach send terminal can be checked using the AC meter function and a known good ground.
dark green is tach send,yellow is key on 12V and black is ground if the wireing harness is still yamaha.
tach send is generated by the ECU.
Also note that there are switches on the gauges that need to be set for the correct number of poles and engine type. You may want to note the settings and then flip the switches a few times in case the contacts are 'dirty' Settings are in the gauge manual.
OK, thanks seasick. I didn't get a chance to dig into it this morning. I got sidelined by a honey-do list, and a ballgame I want to watch is fouling up the afternoon. Tomorrow I will try again. This is the gauge....
Your gauges are 23 years old.
One option is to remove both gauges, swap them and see if the bad one works.
If so, you don't have a wiring or signal issue but a gauge issue.
One option is to remove both gauges, swap them and see if the bad one works.
If so, you don't have a wiring or signal issue but a gauge issue.
Dont know for certain but it might be easier to swap the cables on the back of the guages assuming the cables will reach
I just came in from working on the tach problem. I figured using the port engine to test the gauge was the way to go like you said. The wiring wasn't really long enough, so I just unplugged the green wire on the port gauge and ran a jumper wire over and plugged into the green on the non-functioning gauge. Started up the port engine and voila, tach working fine. I put the wires back where they belonged and studied all the wiring and how it compared to the port gauge. The yellow wire has a in-line fuse holder, so I pulled it apart and when I did the glass tube pulled out of the end caps. The element looked corroded a bit and broken of course. I replaced the fuse and all is well. Starboard gauge reading steady.
Thanks for the help seasick. Knowing the colors was the key.