Electrical problem in OMC 5.8

bruceb58

Supreme Mariner
Joined
Mar 5, 2006
Messages
30,587
Re: Electrical problem in OMC 5.8

So...with the meter measuring the battery with the engine running, what is the voltage? Use the meter...don't trust what the dash gauge says for now.

Is there a reason you aren't measuring the voltage with a meter and letting us know what it is?
 

jmarine225

Petty Officer 3rd Class
Joined
Jul 13, 2009
Messages
95
Re: Electrical problem in OMC 5.8

okay, just back from the lake and I have the results. This may be a bit lengthy but full of info. Batteries are Everstart 24DP (dual purpose) in a 1993 Four Winns Vista 245.

Arrived at the boat. Battery 1, boat not running was around 7 volts (do not have a digital tester) Battery 2 boat not running was a little over 12. Fired up the boat and battery 1 went to a little over 14. Ran it for a while at some higher RPM's and it stayed at the same reading. Dash gauge was initially reading around 11 with the engine running....increased the RPM's and the gauge went up to around 13--highest reading I could obtain. Turned some electrical stuff on (lights, blower etc) to purposely drain power while running the boat and noticed a slight dimming in the lights every 10 seconds or so. Shut the boat off checked battery 1 again on the tester it was around 10. Waited a few minutes and it was back down to 7 and didn't move. This was with no electronics on.

Battery 2 remained at the same voltage then entire time and was used to start the boat. I removed battery 1 (after removing a small shock which sucked) and returned to Walmart where it was purchased in June 09. It is an Everstart Battery. They placed it on their charging/analyzing system and said the battery was no good and provided me with a free replacement.

Now the question is, (1) was the dead battery causing the problem as battery 2 is fine, (2) problem with my alternator as it is not providing enough electricity, (3) bad voltage gauge on my dash. As I said battery 2 is fine the entire time and when running the engine on the batteries i'm showing over 14 volts. Sorry about the long post but I wanted to be thorough.
 

bruceb58

Supreme Mariner
Joined
Mar 5, 2006
Messages
30,587
Re: Electrical problem in OMC 5.8

Sounds like your alternator is fine. Not sure where you put your battery switch while you were running the engine but if you selected "Both" and you failed battery had a bad cell, it is possible that the bad battery was getting all the charge that your alternator was putting out and your "Good" battery was not charging at all.
 
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