1972 85 hp johnson rectifire problems

[ssntb]

need helllllp<br /> rectifire burned up on my 1972 85hp johnson so i went and got a new one...put it on (correctly) but as soon as i hook up the battery the damm thing gets burrning hot an it fried again? any suggestions?

 

[Ross J]

Re: 1972 85 hp johnson rectifire problems

Hi Ssntb, and welcome to the board.<br />It sounds like one of three things - 1 Battery terminals wrong way around. - 2 Rectifier diodes blown. - 3 Problem other than the rectifier.<br />Sorry to bring bad news but there's only a couple of things that can go wrong with the rectifier, it either works fine or it doesn,t. Have you got a manuel to look up the tests or would you like me to print same here? My manuel id for a 74 onwards motor but it should give good guidance.<br />Ross

 

[petryshyn]

Re: 1972 85 hp johnson rectifire problems

Ross J is right.<br /><br />>check the battery cables. Is negative going to engine ground? If it is, then the rectifier is being hooked up wrong. No other possibilities.

 

[Joe Reeves]

Re: 1972 85 hp johnson rectifire problems

SSntb.... That's a heartbreaker to install a new part and have it blow. Using a voltmeter, check the connection on the terminal block where the RED wire from the rectifier would go. It should indicate 12v (+) positive voltage. No doubt it will indicate 12 (-) negative voltage (reverse polarity) which the rectifier will not tolerate.<br /><br />Even if the battery is hooked up properly, there is always the possibility that it has been charged backwards (it happens). If, with a voltmeter, the positive terminal of the battery indicates a negative charge, drain the battery completely of voltage with a auto headlamp (or a item of your choice). When the battery is completely discharged, you can then charge it properly.

 

[ssntb]

Re: 1972 85 hp johnson rectifire problems

acctually if some body could send me a wireing diagrame for this motor that would be wonderful!!!!!

 

[Ross J]

Re: 1972 85 hp johnson rectifire problems

Ssntb, Happy to help with wiring diagram but havn't got technoblurb enough to know how to put pictures or diagrams onto this site. Otherwise I'd use my digital camera to help others. If you want a fax copy I can arrange it.<br />E-mail Jamiesor@hotmail.com<br />By the way, what does ssntb stand for? I'm guessing it's "Stainless Steel ?N? The Boat. Am I close?<br />Ross

 

[beachcraft]

Re: 1972 85 hp johnson rectifire problems

Hi,<br /><br />I have the same problem w/ the voltage regulator/rectifier.<br />It got heat up and burned out even with the new one. <br />Ther e was no short, because the engine was running w/o charging. It turned out the AC voltage from the alternator/stator<br />being to too high (something wrong w/ the stator...).<br /><br />If you don't have any short in your electrical, it could be the source generate too much voltage.<br /><br />Use the voltmeter and check for voltage input to the rectifier.<br /><br />BeachCraft.

 

[ssntb]

Re: 1972 85 hp johnson rectifire problems

thanks every one!! i found the problem!!! it was a bad battery!!! got a new one and a new rectifire and im back on the water!!!! and so you know ssntb is the initals of me my wife and my son<br />steve ... sandy ... n ... taylor ... begley

 

[Ross J]

Re: 1972 85 hp johnson rectifire problems

Well done mate!<br />It just goes to show how well this board works dosen't it?<br />Happy boating<br />Ross