Charging issues

[Jaredchr]

I have a 2003 40hp mercury motor on my pontoon and have been out trolling and my battery has been going dead. It is a new battery and I also replaced the regulator and took it out this weekend and am still having the issue with it going dead. Could I be pulling to much for what it can replace?? need help

 

[bruceb58]

Charge the battery with a battery charger and measure its voltage once you remove the charger for 30 minutes.

If the battery voltage is 12.6V, do a load test on the battery.

If the load test passes, start your motor and measure voltage. Your voltage spec will be in your service manual but will likely be around 14V.



I know you said you replaced the battery but I would still do the battery tests first.

 

[Jaredchr]

with the motor running check the voltage at what location?

 

[bruceb58]

At the battery.