I'm sorry to say we don't have a wiring diagram for the Strapjack Plus. If you have a Strapjack Plus acquired from LR Baggs, here is the pin assignment description.
The Strapjack Plus has four conductors - TIP, RING, SWITCH and GROUND. The TIP and RING are both a matte finish, TIP stamped with a "1" and RING stamped with a "2." The TIP contact is the shortest of all and is parallel with the large ground tab. The SWITCH is also a short tab but is not matte finished or stamped with any number. The GROUND tab is large and unmistakeable.
Assuming the RED is signal, WHITE is switch and BARE is GROUND, you should wire it as follows:
RED to TIP
WHITE to SWITCH
BARE to GROUND
Please reply here or to [email protected]
if you have further questions.