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-   -   Battery mystery (https://www.sailnet.com/forums/general-discussion-sailing-related/326212-battery-mystery.html)

mstern 10-08-2018 10:35 AM

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!

paulinnanaimo 10-08-2018 11:30 AM

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.

mstern 10-08-2018 02:02 PM

Re: Battery mystery
 
Quote:

Originally Posted by paulinnanaimo (Post 2051557122)
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?

paulinnanaimo 10-08-2018 03:17 PM

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.

Capt Len 10-08-2018 03:32 PM

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

mstern 10-08-2018 04:47 PM

Re: Battery mystery
 
Quote:

Originally Posted by paulinnanaimo (Post 2051557158)
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.

Mike Banks 10-13-2018 02:39 AM

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.

Minnewaska 10-13-2018 05:30 AM

Re: Battery mystery
 
Quote:

Originally Posted by Mike Banks (Post 2051558174)
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.

paulinnanaimo 10-13-2018 10:09 AM

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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