Toolholder

The humble toolholder cavity, underneath the seat and behind the battery, serves an important purpose as it is also the mounting point for both the rectifier and the regulator.

Here's the battery plate

and the rear of the tool holder

Notice that the RHS battery strap is held captive by the battery plate. Only the LHS can come free, so the battery must be slid out via the LHS

This is the seat retainer, which screws into the top of the toolholder

The rectifier screws into the LHS of the toolholder

 The voltage regulator on on the RHS. The white connector is to the rear lighting loom.

 The rectifier with the connectors pulled out:

This is the toolholder removed, with the rectifier and regulator on either side

and a picture of the frame with the battery, battery plate and toolholder removed: