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post #11 of 19 Old 10-08-2018 Thread Starter
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Re: Battery mystery

Thanks guys (and Denise)! Sounds like a bad connection is my prime suspect. I'm going to try and test this out before they haul my boat sometime this week!
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post #12 of 19 Old 10-08-2018
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Re: Battery mystery

Just some reassurance about the deep cycle battery. Our 15 hp Saildrive motor is a modified Johnson outboard. We were out sailing on Saturday. Battery number 1 showed about 12.2 volts and started the motor easily. (This is an 8 year old battery). I have experimented in the past by starting the motor with the gauge showing less than 12 volts. Because we sail and avoid motoring, I have 2 batteries, more for peace of mind than necessity. These are very regular inexpensive batteries.
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post #13 of 19 Old 10-08-2018 Thread Starter
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Re: Battery mystery

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Originally Posted by paulinnanaimo View Post
Just some reassurance about the deep cycle battery. Our 15 hp Saildrive motor is a modified Johnson outboard. We were out sailing on Saturday. Battery number 1 showed about 12.2 volts and started the motor easily. (This is an 8 year old battery). I have experimented in the past by starting the motor with the gauge showing less than 12 volts. Because we sail and avoid motoring, I have 2 batteries, more for peace of mind than necessity. These are very regular inexpensive batteries.
Paul: do you have your batteries wired to a switch, or do you run them in series?
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post #14 of 19 Old 10-08-2018
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Re: Battery mystery

I have a basic on/off/both switch. I usually use only one battery for everything, and save the other for an emergency...hasn't happened in over 20 years. I try to alternate between them so that hopefully they will wear out sort of evenly. I purchased them new 8 years ago and the meter indicates that they are aging fairly evenly.
I have a basic multi meter stuck with Velcro to the bulkhead and hard wired into the battery circuit, makes monitoring very easy. I spent an extra few dollars for a meter with auto shut off as I often forget to turn it off...it operates on it's own 9 volt battery.
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Re: Battery mystery

So after cleaning ALL connections, and sitting back with a beer, Put the ohmmeter to the terminals of the either neither. Age and water tend to eventually gum the internals .A poor connection in there will be an annoying VD
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Re: Battery mystery

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Originally Posted by paulinnanaimo View Post
I have a basic on/off/both switch. I usually use only one battery for everything, and save the other for an emergency...hasn't happened in over 20 years. I try to alternate between them so that hopefully they will wear out sort of evenly. I purchased them new 8 years ago and the meter indicates that they are aging fairly evenly.
I have a basic multi meter stuck with Velcro to the bulkhead and hard wired into the battery circuit, makes monitoring very easy. I spent an extra few dollars for a meter with auto shut off as I often forget to turn it off...it operates on it's own 9 volt battery.
Nice. Something to consider for next season.
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post #17 of 19 Old 10-13-2018
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Re: Battery mystery

Deep cycle batteries make poor start batteries unless you have one of those which have a special start battery included or extra plates.

If your home charger will not charge--it is often because there needs to be at least eight volts present in the flat battery or the electronically controlled charger will not function. Once it IS charging though--it is OK--so I use a different battery such as a jump-starter in parallel with the flat one just to get the charger to work, then remove the jump starter. After they they seem to charge OK.
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Re: Battery mystery

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Originally Posted by Mike Banks View Post
Deep cycle batteries make poor start batteries unless you have one of those which have a special start battery included or extra plates.
The OP has an 8hp outboard. Deep cycle will work well.

Iíve never heard of a battery with a special start battery included. As far as plates go, there are many different qualities of FLA batteries and plates can be one identifying difference.


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post #19 of 19 Old 10-13-2018
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Re: Battery mystery

Another good sailing day yesterday although the wind was at the upper end of our comfort zone. I experimented again. The voltmeter was showing 12.19 volts. I had my wife attempt to start the motor with no choke or throttle( she drives out of the slip while I control the dock lines). The motor cranked very quickly for about 7 or 8 seconds until my wife engaged the choke. It would have turned over for much longer but I wasn't going to risk damaging the starter just to prove a point. Our Saildrive is a 15 hp outboard power head.
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