rectifier... charging unit install...

hi all...
Ill try and be fast and simple..

Nissan 9.8 4stroke longshaft

bought the proper rectifier kit for it..

Four wires to hook up Black (ground) Red (output power), yellowish brown and white plug into existing harness of motor and match colours perfectly...

when all hooked up...at idle...
output 8.2 volts at .2 amp
measured voltage of the harness (yellowish and white wires) 6.3 volts...(not connected to rectifier..just measured output from magnto feed)

the voltage of the rectifier does go up as i rev the motor.. but is this correct? i thought it shoule be... at least 12v and more like 13.5...behaving much like an altenator charging unit....

can some one verify that the numbers are legit....or is this unit faulty out of the box...



thanks for all your help in advance,.,

Safe boating!!

Noel

Re: rectifier... charging unit install...

Seems a bit low maybe. But those small engines do not do much at idle. You never said what the voltage goes up to when you rev the engine? It should put out a little over 13v at say half throttleish. The stator is an altenator and should behave that way.

Re: rectifier... charging unit install...

it did go up when reved it....over 9 v..
i didnt crank on it... (i tend to go easy on motors with no load..)
Ill check when im out there trolling...(avg use)
I just didnt want to have it scavenging power from bat.....
Ill water test it...
But i thought it should be at least 12-13.5 even at idle...

thanks for you quick response...

Noel

Re: rectifier... charging unit install...

Noel,

I'm guessing you have an NS9.8A3, right? You should have a higher output voltage, probably 14-15v, and at anything over about 3000 rpm, expect 5 or 6 amps, if the battery is accepting a charge. It will max out at about 6a, and it is regulated as well -- something other, earlier systems were not. Grab your Factory service manual, available from any dealer (including me), and test the diodes in the rectifier. Also be 100% sure the rectifier is properly grounded. You may have a bad diode in the bridge, or a poor ground. The open-circuit output of the alternator coils should be a lot higher than 6v. Are the alternator coils showing the correct resistances (as per the Factory service manual)?