Modifications to the amplifier

[didineedthat]

I was reading this other day on this website about how to modify the 1970 Johnson 60 hp by removing the amplifier and replacing with coil,ballist resistor and condensor, well I have such an engine and low and behold it has already been modified almost exactly how it written on this website,but it has one extra part that looks like a very old amplifier but not the one that would have been installed on this motor orginally. I am trying to discover what it is. The part number is 315480 and is located on the front cover. about three inches long and six sides with ends coming to a point where holes are located for screwing. There are four wires coming from it. The wires almost match the orginial amp but except for the black and white stripe wire is not their. yellow, yellow gray stripe, two black. <br /><br />model 60es-70d does anyone know what the d means?<br />serial# J3302881<br />I am restoring back to original but want to retain how this engine is currently modified for future reference is why I am trying to find what this part is. <br />Thanks

 

[didineedthat]

Re: Modifications to the amplifier

The fourth part is a clipper circuit. I still trying to find out if it needs to be there when updating using the wabash amp. They must not make them anyone because I cannot find one forsale

 

[WillyBWright]

Re: Modifications to the amplifier

The clipper was sort of a regulator that would hopefully prefvent the amp from failing due to voltage spikes. Sometimes it worked that way. Other times the amp died, many times both did. You don't need it. If it works, use it. If it doesn't, don't worry about eliminating it. But be real sure you have a good battery with clean tight connections. Bad battery connections fry those parts. They suggest a new coil with a new amp. The D is a suffix used for 1970 motors that got the clipper. No D, no clipper (unless one was added later).<br /><br />I have an important service bulletin regarding the gearcase. It involves a modification necessary to prevent the upper driveshaft bearing from failing due to lack of lubrication. I believe that the D suffix also means that the modification to the gearcase was already done, but I can't guarantee that. Click on the little man beside the house icon above and email me. I'll send you a copy.