Ramblin' Guy
Active Member
- Nov 8, 2021
- 156
- Boat Info
- 1997 370 Sundancer
- Engines
- 370 hp 7.4 MPI Horizon w/V drives
I just bought a 1997 370 Sundancer with 7.4 MPI Horizons. I'm hoping someone with boats in that vintage can help me out. I have the Sturdy Engine Synchronizer (I think it's the first generation, because the manual posted on these forums is for a later version). When I try to engage the synch with the throttles near each other, the port engine goes to idle. I'm guessing with my limited knowledge of these synchs that the starboard is the master, and the port is the slave, and the port engine thinks the starboard is at idle (it isn't getting a signal).
I'd like to check this in the spring, but I'm hoping someone on here can tell me where the spark signal comes from on the engine if there's no current doughnut around the spark plug wires. The manual seems to think there's a connection point on the distributor or coil or something that gives a signal. I can see the wires on the synchronizer itself, but they disappear into the loom and there's no chance of me finding where they come out without some direction. I'd also like to know how to measure if there's a signal at the synch itself. I'm thinking that it's not a 20,000 volt pulse, but it probably is quick and not able to be seen by the average multimeter.
Any advice on debugging these contraptions is very appreciated!
I'd like to check this in the spring, but I'm hoping someone on here can tell me where the spark signal comes from on the engine if there's no current doughnut around the spark plug wires. The manual seems to think there's a connection point on the distributor or coil or something that gives a signal. I can see the wires on the synchronizer itself, but they disappear into the loom and there's no chance of me finding where they come out without some direction. I'd also like to know how to measure if there's a signal at the synch itself. I'm thinking that it's not a 20,000 volt pulse, but it probably is quick and not able to be seen by the average multimeter.
Any advice on debugging these contraptions is very appreciated!