1988 Mercury 100 4 cyl, voltage problem?

[donmanning121]

Can anyone tell me what voltage the regulator is supposed to deliver?<br /><br />I'm getting 13.5 at idle and 14 at 1000 rpm. Then I get higher and higher readings when wide open - 15 to 16 volts.<br /><br />None of my gauges seem to work correctly - trim and temp never move - tach sometimes reads 1000's high - even voltmeter is off.

 

[The Marine Doctor]

Re: 1988 Mercury 100 4 cyl, voltage problem?

I would hope the Voltage Reg would keep the voltage at mid 13's...You might want to replace it as it does not seem to regulate voltage very well.<br /><br />TMD

 

[Spidybot]

Re: 1988 Mercury 100 4 cyl, voltage problem?

Wakerider,<br /><br />You have just demonstrated why replicating the same post to more forums is a very bad idea.<br /><br />Nevertheless, I'll follow up on my answer in 'Outboards':<br /><br />If your voltage is above 14.5 volts when the motor runs - also idle - the voltage regulator has to be replaced.