Rectifier question - 1988 Johnson 50HP

[canadian_fisher]

Folks.<br />I just helped my buddy install a Sierra Marine aftermarket rectifier / regulator for his 1988 50HP Johnson outboard. The orignal had melted RED wire to chassis.<br /><br />The OMC part had Three Yellow wires with color patterns and a RED output wire.<br />The Sierra part has Three Yellow wires but no distinct color patterns to match-up properly.<br />Upon "random" installation and testing, the RED wire output shows DC output that's very erratic. The multimeter in DC shows a wild range of 6 to 19 Vdc.<br /><br />What's up here? Bad Stator?<br />BTW: Motor runs fine with or without.<br /><br />Cheers Corey.

 

[npd4432]

Re: Rectifier question - 1988 Johnson 50HP

On my 3 wire rectifier it did not matter where the yellow wires were placed they were interchangable.

 

[ob]

Re: Rectifier question - 1988 Johnson 50HP

You can check the two yellow output wires from stator to reg/rec for voltage .I believe it should be around 18-20 V AC.

 

[Silvertip]

Re: Rectifier question - 1988 Johnson 50HP

Melted red wire to the chassis????? Chassis is ground -- red wire is 12V. No wonder it melted. I hope you had the red wire connected to the battery via the solenoid when testing. Never run a motor without a battery connected. Regulator/rectifiers don't like that and its the reason your readings are erratic. You will also void the warranty if you happened to have popped the new unit.

 

[canadian_fisher]

Re: Rectifier question - 1988 Johnson 50HP

Upinsmoke!!<br /><br />Sorry, what I meant to say was that the OLD rectifier needed replacing because the RED wire "somehow" overheated and shorted to the engine body. This was probably due to a loose wire to the main battery (or my buddy was trying to charge TWO batteries at once.....)<br />The NEW unit was installed correctly but next step is to test the STATOR for a maximum AC output.<br />We'll get a chance this weekend when the motors back in the lake.<br /><br />Cheers. Corey

 

[red boat]

Re: Rectifier question - 1988 Johnson 50HP

Canadian , did you ever get your xp-150 running correctly and what was the final diagnosis?