charging system

[thmlrmg]

i have a '75 evinrude 70hp motor and i have a brand new battery that is now dead. how can i tell if the charging system is working or not. this may have been a defective battery.

 

[smalloutboardsarecool]

Re: charging system

Most Likely the alternator Burn out the battery. Is there a Regulator, an over voltage current protector, and a one way fuse that allows the voltage only to flow in one direction. You may of burn out the alternaotr or the Batteries... Or both!

 

[thmlrmg]

Re: charging system

^

 

[Trent]

Re: charging system

Easy...Charge battery fully. THen with a voltmeter check the voltage at the battery. Should be about 12.5 dc Volts. Then crank and run the engine and re-check. Should be above 13.5 dc Volts. If not she is not charging. <br /><br />If she is not charging then we have to check the output of the stator for AC voltages next.

 

[oldboat1]

Re: charging system

If you like the idea of replacing parts (the bolt on variety) to see if you can fix the problem, try another rectifier (triangular shaped, probably 4 wire connection) -- best if you can get a used one known to be good, other wise you can pick up a new one for between 30 and 40 bucks. (NAPA probably has it in a Sierra after-market model.) The rectifier is usually a pretty good bet.