Does my motor have a voltage regulator? 1988 Sea Ray 100 HP

[donmanning121]

I have looked and looked to find the voltage regulator on this engine - 1988 Sea Ray (Mercury) 100 HP 4 cyl - #B279552. My local mechanic even told me where to look - (on top of the air horn) but all I see there are empty screw holes.<br /><br />His computer doesn't specify which of 3 alternative parts is the right one to replace it - I have to find out which type one I have now.<br /><br />This motor produces variable voltage depending on engine rpm - I think maybe it always has, since I got it in 92.<br /><br />I am concerned about intermittent problems with the tach reading high - and had read a previous thread suggesting that the voltage regulator or rectifier may be the cause. I am stuck with my troubleshooting however because I can't find it.

 

[The Marine Doctor]

Re: Does my motor have a voltage regulator? 1988 Sea Ray 100 HP

Some of the 4 cyl product did not have the large square voltage rectifier that others had.<br /><br />Easiest way to find what you have.<br /><br />Follow the yellow wires from the stator. They may go to a gray terminal block. From there to a rectifier and tach.<br /><br />TMD

 

[Trent]

Re: Does my motor have a voltage regulator? 1988 Sea Ray 100 HP

Take a look here. This is for your serial number. Depends on what you have...<br /><br />Items 40 and 43 are regulators.<br /><br /> web page<br /><br />These people have aftermarket.... web page