There is a fairly large space underneath the seat pan just above the rear fender on a 1980 XS1100G. I used the space to store a spare regulator/rectifier.
Drill and tap two holes in the underside of the seat pan to hold the spare regulator/rectifier.
![](http://farm2.static.flickr.com/1307/4669279704_5b9f6ae8db.jpg)
The two Allen bolts are long enough to go all the way through the aluminum heatsink into the threaded holes in seat pan without creating a spike in the pillion seat foam.
![](http://farm5.static.flickr.com/4010/4669277544_8499055737.jpg)
The spare regulator/rectifier is bolted to the seat pan and the bolts secured with blue Loctite threadlocker.
![](http://farm5.static.flickr.com/4032/4668650511_9f5de89041.jpg)
Looking up from the left-hand saddlebag at the spare regulator/rectifier with the seat installed. The wire connectors are covered with duct tape to keep out oil, dust and water.
![](http://farm5.static.flickr.com/4045/4669273180_8c2939be98.jpg)
The spare regulator/rectifier is not visible at or above seat-level except for a reflection on the rear fender.
![](http://farm2.static.flickr.com/1303/4668646101_646b87c68c.jpg)
Now it's time to load up and head out for a ride!
Drill and tap two holes in the underside of the seat pan to hold the spare regulator/rectifier.
![](http://farm2.static.flickr.com/1307/4669279704_5b9f6ae8db.jpg)
The two Allen bolts are long enough to go all the way through the aluminum heatsink into the threaded holes in seat pan without creating a spike in the pillion seat foam.
![](http://farm5.static.flickr.com/4010/4669277544_8499055737.jpg)
The spare regulator/rectifier is bolted to the seat pan and the bolts secured with blue Loctite threadlocker.
![](http://farm5.static.flickr.com/4032/4668650511_9f5de89041.jpg)
Looking up from the left-hand saddlebag at the spare regulator/rectifier with the seat installed. The wire connectors are covered with duct tape to keep out oil, dust and water.
![](http://farm5.static.flickr.com/4045/4669273180_8c2939be98.jpg)
The spare regulator/rectifier is not visible at or above seat-level except for a reflection on the rear fender.
![](http://farm2.static.flickr.com/1303/4668646101_646b87c68c.jpg)
Now it's time to load up and head out for a ride!
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