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Electrical/Starter Issue

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irrelevant

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I have a 26' Glacier Bay with two well maintained, under 1000 hrs Yamaha 150's.

Each engine has its own battery and battery switch allowing each engine to start using battery one, two or both.

Recently an issue has developed which I can't get my head around................

The starboard engine will start easily on battery one or two. The port engine will only start once the starboard engine is running and then only with its battery switch set to both.
Both battery switches are in good condition and working correctly. I have also swapped batteries around and even replaced them with new ones, but whatever I do the situation remains the same.

I would very much appreciate others thoughts on this.

Thanks
 
Had the same thing on a single. No start on one battery but both got it going. Turned out to be a bad ground wire. Check your isc valve as well. Might need a clean.
 
Check the battery cables (+ve and -ve) going from the port battery to the port switch and engine. From what you have posted I suspect a bad cable end or connection.The cable ends may look OK, but they can corrode under the heat shrink and be bad even when looking OK. Try bending the cable at the heat shrink to see if one end bends more easily than the others. I would also take the -ve cable off the engine block and clean up the connection at that point. This is a reasonably common failure point on some Yamahas.
 
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