Yamaha 200 starting problems

Tango21

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I have a 2016 Freedom 275 with twin Yamaha 200 4-strokes. Last weekend when I went to start the motors, the Starboard motor starter just clicked like it had a bad battery (battery #1 is less than 24 months old). I switched the Starboard motor to battery #2 and she cranked right up. I switched the Port motor to battery #1 and it just clicked. Conclusion: replace battery #1, so I did. After installing the new battery the problem remained. Local boat mechanic said it’s probably the battery switch. So I replaced that. Problem remains. So here’s what we have. Both motors won’t start when switched to battery #1. Both motors will start when switched to battery #2. Both motors will start when switched to both batteries. Voltage on new battery is 12v +/-. All battery contacts have been clear and connections tightened. What am I missing and why won’t either motor start when switched to the good Battery #1?
 

seasick

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Did you 'play' with the battery connections before you had the problem? ( for example, did you disconnect for the winter and just reconnected?) If so, make sure that the black battery cables that connects the two batteries together is actually connected at both ends.
Bad battery switches are rare. More likely a bad battery cable or dirty/loose connection.
One lesson here is that it is advised to do more diagnosing before starting to change parts:)

What you didn't try or at least didn't mention was if you tries to start port motor on battery 1. That would help with the diagnosis.
 
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Tango21

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“I switched the Port motor to battery #1 and it just clicked”. All possible motor/battery combinations were tried. With the same results - neither motor would start using battery #1. Connections are clean and tight.
 

wrxhoon

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You have at least one connection that is not clean. Take the cables off from battery one and clean them with a battery terminal brush or a round file, do the same with the cable that goes from battery one to battery two. When you get it working use terminal spray on the battery poles . If you ever disconnect the batteries you must clean them again.
 

seasick

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yank on the cables at the lugs to see if any are corroded/loose. That can be tough to do if there is heavy shrink wrap on the cable ends.
It is unlikely that you had a bad battery and the new one is also bad.
If you are familiar with electrical things, the problem is easily isolated by measuring voltage drops at various points both on the 12v and ground side with no loads and with a load (like when cranking)
 

Father's Day

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After you check and double check all other possibilities get another battery switch.You might have gotten a bad one, I change parts for a living and believe me it happens
 

Rlloyd

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Try swapping out the cable between the switch and the battery. That's the only piece of this that hasn't been changed yet.