here are the connections, no theory. this assumes the trailtech goes up to 28v if it does not you have to float ground.
rectifier + terminal------- capacitor+
rectifier ac terminal----- stator wire, trailtech +
other ac terminal ------- n/c
rectifier negative terminal ------ n/c
frame ----------------------- capacitor - and trailtech regulator -
14v is between rectifier + and the frame. .
this assumes the trailtech only goes to 14v or you are using a cheapo blaster or dirt bike 2 wire 12v ac regulator.
rectifier + ------ cap +
rectifier ac --- stator wire, trailtech +
other rectifier ac ---- n/c
rectifier negative -- new floating ground. it floats at -7v.
frame -------------- trail tech -, cap -
14v rectified and regulated juice is between the new ground and + on the rectifier.
you can not use the frame as ground in this configuration. (edited)