The H22 has a two way switch
In one position (the one on the schematic below), it is a classic one pickup wiring with tone and volume potentiometers. In the other position, the tone pot has no use (open circuit), and a 0.005 cap is added in the circuit, to remove some of the lower frequencies.
When I bought my H22, the wiring was a mess, I found nothing on the web and nobody could draw a diagram for me, so later I bought an original new old stock harness, photos below.
On my 1964 H22 Bass, the pots are marked as follow :
Tone : R-21 1346409 250K Centralab made in usa
Vol : R-22 1376302 CTS made in usa
I suppose it's a 1 Mohms pot, but I measured 1.5 Mohms.
On the harness I bought later, the pots are marked as follow :
Tone : R-21 1346449 250 K Centralab made in usa
Vol : R-22 1376449 1MEG Centralab made in usa
The white wire is not original.
an H22 pickup should measure about 12.5 kohms resistanec.
The H25 has a two rockin switches
