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First time posting here.
I've read thru as many posts about this issue as I can... here and elsewhere. I know there was a warranty/technical update campaign on the 03' F225 model year and mine is an 04' F225 TXRC with a 7-03 build date.
My batteries group Sear's Diehard 31 AGM's about 4 yrs old. Never fail to start and although I have not load tested them, I'm fairly confident they're in good condition. Here's what I've observed.
Upon start up (batteries on both) voltage is about 13.8 to 14.2 vdc. As the engine warms the voltage goes up to 15.8 at idle ( less then 5 mins) and if I running on one battery, the voltage output goes higher ... 16+ volts and
have seen as high as 18vdc according to my gauges. I confirmed by using my Fluke digital volt meter. I can get voltage to drop as I introduce/turn on additional load... VHF, Stereo, lights etc. Voltage can be lowered to 14.8 with everything on, but isn't steady. + 1 volt variation but never goes below 14.8.
Went by my Yamaha parts/repair center and purchased a "used" rectifier/regulator. The R/R came out of a 05 engine and the connector colors are 2 blue , 2 black and 1 grey... same as what was originally in mine. I understand connector color maybe indicative of the updated part but not sure what color is updated.
So.... the R/R I just installed is doing exactly the same thing as my original. Yes I understand the used part maybe defective but I was told the engine was running fine with no issues. I also understand ... what else would they say? The Yamaha dealer is well established and reputable.
So I checked the ground off the R/R as best I could (can't fine point of termination) did not check connection for resistance but used a test light in reverse. Ground is connected. My print shows two grounds (2 blk wires) but my R/R has only blk wire and one with a blk/white stripe. I checked only the blk wire.
Because of the variation in voltage with a full load I suspect a high resistance to ground. Maybe the connection need to be more robust? or larger wire? but I'm not confident that I have identified the single blk wire as "the" only ground.
So.... sorry about the length of my first post... but I tried to be comprehensive. Any help or suggests will be appreciated.
I've read thru as many posts about this issue as I can... here and elsewhere. I know there was a warranty/technical update campaign on the 03' F225 model year and mine is an 04' F225 TXRC with a 7-03 build date.
My batteries group Sear's Diehard 31 AGM's about 4 yrs old. Never fail to start and although I have not load tested them, I'm fairly confident they're in good condition. Here's what I've observed.
Upon start up (batteries on both) voltage is about 13.8 to 14.2 vdc. As the engine warms the voltage goes up to 15.8 at idle ( less then 5 mins) and if I running on one battery, the voltage output goes higher ... 16+ volts and
have seen as high as 18vdc according to my gauges. I confirmed by using my Fluke digital volt meter. I can get voltage to drop as I introduce/turn on additional load... VHF, Stereo, lights etc. Voltage can be lowered to 14.8 with everything on, but isn't steady. + 1 volt variation but never goes below 14.8.
Went by my Yamaha parts/repair center and purchased a "used" rectifier/regulator. The R/R came out of a 05 engine and the connector colors are 2 blue , 2 black and 1 grey... same as what was originally in mine. I understand connector color maybe indicative of the updated part but not sure what color is updated.
So.... the R/R I just installed is doing exactly the same thing as my original. Yes I understand the used part maybe defective but I was told the engine was running fine with no issues. I also understand ... what else would they say? The Yamaha dealer is well established and reputable.
So I checked the ground off the R/R as best I could (can't fine point of termination) did not check connection for resistance but used a test light in reverse. Ground is connected. My print shows two grounds (2 blk wires) but my R/R has only blk wire and one with a blk/white stripe. I checked only the blk wire.
Because of the variation in voltage with a full load I suspect a high resistance to ground. Maybe the connection need to be more robust? or larger wire? but I'm not confident that I have identified the single blk wire as "the" only ground.
So.... sorry about the length of my first post... but I tried to be comprehensive. Any help or suggests will be appreciated.
I'll bring that baby back feeling so smart... and indignant, LOL. 
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