Wiring mod to CLASS head power circuit 1st gen's

[dingy]

Below is a brief description of a circuit modification to the CLASS system wiring to allow the system to be adjusted while the bike is running. This can be done with only removing the faux tank cover. I mentioned doing it in the thread below and a couple of members requested some details on it so I started a new thread detailing it.

 

http://www.venturerider.org/forum/showthread.php?t=51557

 

I would like to preface this by saying that caution should be used if you choose to do this. Use care if you adjust air pressure in system while riding. I do not feel it will adversely affect the handling of the bike, but it will distract you. Not anymore than adjusting the CB or radio, but be careful. Yamaha states in the manual to put the bike on the center stand to adjust the air levels. A lot of people do not do this. I prefer to adjust it when sitting on bike so I can adjust ride height so I can see over the windshield. This adjustment varies depending on bike load.

 

On 1st gen bikes with the Class system, there is an extra contact in the ignition switch that is energized only when the key is in the ACCY position. This circuit then goes to the CLASS fuse that is in a separate holder, located on the right side of the fuse panel above the battery. This fuse holder is shown in the first picture.

 

All that is required to energize the CLASS system is to wire in a switch and fuse holder to provide positive 12 volt battery to one side of the CLASS fuse holder. I strongly recommend that you do use a switch on here so as to not power up the CLASS system all the time. I measured the current draw on the CLASS system, it pulls a little under 1/2 amp at rest and 5 amps when the compressor is running. The additional current draw full time on the system is avoidable by using a switch. The 1st gen's are known for having little extra capacity in the charging system as is.

 

The second picture shows a switch with a fuse on the positive side. The blue wire is spliced into the existing CLASS fuse holder on the wire opposite the locking tab on the connector. This is the bottom wire in the first picture.

 

The fused side wire is spliced into an accessible wire that is switched on when the key is in the on position. I used the wire that feeds the Accy block on the fuse panel. I attached this wire before the fuse to the Accy terminals. I did this so as to not overload the Accy fuse. The Accy terminals are energized when the key is in the ON or ACCY position.

 

I mounted the small toggle switch in the fairing side cover. The use of a lighted switch would be helpful to show the system is energized. A lighted switch would also require a wire being run to ground to operate the switch.

 

16 gauge wire and a 10 amp fuse is sufficient to for this.

 

Also attached is a partial wiring schematic showing this mod. The additional wiring is in the red 'cloud'. This is only a partial schematic, I deleted a lot of the wiring to make it easier to pick out. Complete schematics for 1st gen Ventures are at the thread below.

 

http://www.venturerider.org/forum/showthread.php?t=42358

 

Gary

[MasterGuns]

Wow; putting this together must have taken a lot of your valuable time I'm sure. I printed your instructions and will get around to this mod soon. Thanks so much.

[a1bummer]

Doesn't get much simpler that that. Thanks!