Wouldn't start - trying to find root cause

Justin Larsen

Member
Oct 9, 2019
50
Canada
Boat Info
220 Overnighter SS 1994
Engines
5.7 w/alpha
Here's a fun one. This weekend I went down to the slip to start my 220OV because it had been sitting for approx 3 weeks. No issues when I docked her last but when I tried to start her this time I got nothing and I mean nothing, no clicks, no roll over, no draw on the voltage gauge. I wasn't in the head space to troubleshoot at the time but pulled the starting battery yesterday which came back fine and went down today to start digging in. First stop was the ignition but multimeter proved no issue there so I moved to the motor. What I found was that voltage on the hot side of the slave solenoid was jumping. 12 to 10 to 3 to 7 to 0 and repeated not always in that sequence but always moving. I traced the red and purple 6 gauge wire back to the harness and beyond and did the old jiggle of the harness. The power stabilized at 12.4 and I decided to try to start the motor. It worked, started and ran fine. Took it through multiple cycles and all is good. I though okay it's a wire issue let's try to recreate it. I tried for almost an hour exploring the harness and moving everything to try and generate a voltage drop but nothing. Every thing seems fine but my confidence to take it off the dock is shaken, I am not a stranger to electrical issues but the fact that I can't recreate it is perplexing. Am I missing something here?
 
Here's a fun one. This weekend I went down to the slip to start my 220OV because it had been sitting for approx 3 weeks. No issues when I docked her last but when I tried to start her this time I got nothing and I mean nothing, no clicks, no roll over, no draw on the voltage gauge. I wasn't in the head space to troubleshoot at the time but pulled the starting battery yesterday which came back fine and went down today to start digging in. First stop was the ignition but multimeter proved no issue there so I moved to the motor. What I found was that voltage on the hot side of the slave solenoid was jumping. 12 to 10 to 3 to 7 to 0 and repeated not always in that sequence but always moving. I traced the red and purple 6 gauge wire back to the harness and beyond and did the old jiggle of the harness. The power stabilized at 12.4 and I decided to try to start the motor. It worked, started and ran fine. Took it through multiple cycles and all is good. I though okay it's a wire issue let's try to recreate it. I tried for almost an hour exploring the harness and moving everything to try and generate a voltage drop but nothing. Every thing seems fine but my confidence to take it off the dock is shaken, I am not a stranger to electrical issues but the fact that I can't recreate it is perplexing. Am I missing something here?

http://www.clubsearay.com/index.php?threads/starting-issues.106411/#post-1256512
 
the Red/purple gets it power from the starters main lug. If you see a white square plastic block attached, that is a 90A fuse link.
 

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