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Library Home Page > 1st Generation (1983 to 1993) > Electrical
A Brief On The Charging System.
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A Brief On The Charging System

Your charging system is three separate sets of windings. If you have a heavy load on the system, one set may finally wear out. This is quite common on Harleys, and somewhat less common for the Yamaha and Honda tourers. It never happens on cars because the windings are cooled by the air (it is usually bearing failure for car alternators as far as my experience goes).

On my 84 Venture, it was the topmost winding that showed the most wear, perhaps because it did not see as much cooling oil as the windings on the bottom of the engine. It is possible to have a mechanic test the three wiring groups without removing anything except a johnson plug. In the short term, the charger will do the job, but with the full charging load on only two sets of windings, you cannot expect another 100,000miles of service. I have heard excellent reviews on rewound stuff; of course the dealer would rather sell you a new one. I am sure that both choices will be very satisfactory.

Scott MacMartin


Checking The Yamaha Charging System

As was suggested earlier, check accross the batter with a accurate voltmeter to verify if the problem is in the charging system OR in the other wiring on the bike. Run the engine at about 3000 RPM, and the voltage at the battery  should be 14.5V plus or minus .5V. It goes down at higher temperature, so if it's in the 80's or 90's, you may only get to 14.1 or so. If it's low, (remove the left body panel (side cover) and about half way up the vertical frame section behind the motor, you will find a plug that has 3 white (with a blue? stripe) wires....this is the connector between the alternator stator and the voltage regulator. Inspect this for burned wiring. If you find a lead that's been overheated, you can cut the plug out, and connect the wiring directly by twisting one stator lead and one regulator lead together, and then soldering them and taping them. If the plug and wiring looks OK, you can disconect the plug, and then take the stator half and measure the AC voltage (at idle) between the 3 pairs (A&B, A&C, and B&C). It should be equal, and if one pair is obviously lower, you have a bad stator. A couple of years ago on my 83, my charging problems were caused by the main fuse link in the smaller red wire that attaches to the battery having it's link come loose.  This link is in a plastic case and it's just to the left of the battery.  Open it up and make sure these screws are snug.

Unless you are pushing the START button the starter and solenoid are completely out of the picture. Unless the battery is charged, the bike will crank slow. The suggestion about cleaning the ground connection at the right front corner of the motor is good.

Frank W. Denk (taken from VentureNet's Mailing List)

 

Last update: 10:17 AM Sunday, September 26, 2004

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