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  Battery will not stay charged

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Author Topic:   Battery will not stay charged
volks posted 06-09-2002 11:56 PM ET (US)   Profile for volks   Send Email to volks  
I recently purchased a 1979 montauk with 100hp Mariner. I have enjoyed this boat for about 1 month, and everything has been running great. The other day the boat just didn't start, I ended up replacing one of the batteries, and she fired right up. Took her out for about an hour cruise. And once I turned the engine off, I couldn't get it to start again. So I repeated this process a couple times now, and the battery continues to keep draining on me. So my question is, can anybody tell what this could be or what to look for, why the batteries will not stay charged. What can cause this sudden draining of power.
Jerry Townsend posted 06-10-2002 12:50 AM ET (US)     Profile for Jerry Townsend  Send Email to Jerry Townsend     
You have either a short in your battery or in an electrical circuit. There are a couple of ways to determine which - with a multi-meter, disconnect the positive lead from the battery, connect the meter between the positive and negative leads and measure the resistance - which should be zero if all switches are off. If the resistance is non-zero, you have a short in one of the circuits (lights, bilge pump, horn, et.al. as applicable). If the above resistance is zero, the short is an internal short in the battery which spells - buy another battery.

Without a meter, charge the battery up and leave disconnected for a couple of days or so. Reconnect the battery and try to start the engine - no start, the battery is bad - if the engine starts, the problem is a short in one of the circuits. ---- Jerry/Idaho

JohnAz posted 06-10-2002 08:24 AM ET (US)     Profile for JohnAz  Send Email to JohnAz     
Without a meter,,,if you hook up a charged battery and every thing is turned off there should be no spark,,or hook a 12v light bulb between terminal and cable end if no short it will not glow

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