tach problem

[gbrummund]

89 Evinrude GT 100<br /><br />Tach use to be intermitent, now does not work. It zero's out when key is on, it sees 12 + volts at tach, it shows the rpm's when the motor is spinning via the starter but when the engine fires up it drops back to zero and does nothing.<br /><br /><br />Any ideas?<br />Thanks

 

[Hooty]

Re: tach problem

Rectifier. Check the voltage at the battery without the engine running. Start the engine and run it at a fast idle (1500-2000 rpm) and check the battery voltage again. If the voltage doesn't go up with the engine running, it's the rectifier.<br /><br />c/6<br />Hooty