merc 200hp 14.5 to 15 volts

[Grady-White-Trash]

Hi everyone<br /><br />Early this year I bought a used 1994 Merc 200hp. I installed it on a grady and did some tests at home. RPM would go to 8000 on the tach but I thought it was a bad gauge.<br /><br />I took the boat out and after about an hour one of the regulators (it has 2) literally melted. I mean black ooze came out of it. I removed it (rpms went normal) and came back home on the other one.<br /><br />I bought and installed one regulator and now the rpms are reading true (cool).<br /><br />But, I hate buts:<br /><br />The voltage is steady at 14 at idle and at 2000 it goes up to 14.5 and keeps rising with rpms up to like 15.<br /><br />I removed the old regultor (the one I came back with) and tested with one a neighbor gave me. Same thing.<br /><br />Is this voltage normal?<br /><br />Can something else have burned?<br /><br />I used a digital multimeter.<br /><br />Thanks

 

[The Marine Doctor]

Re: merc 200hp 14.5 to 15 volts

Try a different battery see if you get the same results.<br /><br />Also check for loose wires.<br /><br />TMD

 

[clanton]

Re: merc 200hp 14.5 to 15 volts

Voltage should stabilize at approximately 14.5 volts at 1000 rpms, with an analog voltmeter. I would clean all charging systems grounds, and recheck. I would think if not over 15 volts is ok. Manual says 16 volts and over is too high.

 

[shelbydriver]

Re: merc 200hp 14.5 to 15 volts

I have the same engine. My mechanic said I should replace both regulaters at once? Is there any reason for that? I think there like 139 each$. Mine is oozing too.

 

[Grady-White-Trash]

Re: merc 200hp 14.5 to 15 volts

Shelby, checkout ebay.