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Author Topic:   Dual Battery
SWarren posted 09-19-2007 08:27 PM ET (US)   Profile for SWarren   Send Email to SWarren  
The original owner of my new boat always ran both of his batteries in the all position for the twin 250 yamahas. He also direct wired all the accesories so the can be run when both battery switches are in the off position.

I do not like this setup as I have always run my twins on seperate batteries, one motor on 1 and the other motor on 2.

I bought new batteries today, because the stb battery was showing red (AC delco voyger. When I replaced them I went to start the motors with port on battery 1 and stb on 2. I only got power to battery one. I switched both to 1 and both guages powered up. I went through whole process checking all combinations. And battery 2 does not work off of either switch. In all on both switches everything works but dont know for sure if I am only running one battery.

This has me confused as my brand new battery could be bad. I doubt it. Or the reason he always ran on all is because he had this problem.

Just dont know what the problem could be. Any ideas? It cant be the switches because battery one works on both.

Any ideas

lavieve posted 09-20-2007 07:26 PM ET (US)     Profile for lavieve  Send Email to lavieve     
Check the wiring between the batteries and the switch. See
SWarren posted 09-21-2007 10:48 AM ET (US)     Profile for SWarren  Send Email to SWarren     
I worked on boat last night and discovered the following:

In port motor postitive goes from #1 switch direct to battery, # 2 goes to #2 on the other switch.

Stb Motor goes from #1 postitive direct to battery.

So basically the #2 switch is useless. You just run each switch on # 1, which will charge each battery seperately. if needing power from both batteries you turn both to all for starting.

Should be easy fix, just need to buy another postive cable, disconnect the # 2 wire and run straight to battery and do same for new cable. Buy a new negative cable and connect straight to batteries without using switches. This would then give me the factory whaler set up.

Why would they have set mine up the way it currently is?


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