Quote:
Originally Posted by jwells393
Measure the output of the switch with respect to ground (the ungrounded outside tab on the volume pot. The reading you get will be a little less than the actual resistance of the pickup. The pickup and the volume pot are in parallel. The equivalent resistance is determined as follows:
Attachment 2239
As an example assuming the actual resistance of your pickup was 6 K ohms and the pots are 250K............ (6x250)/256=5.86 K ohms |
Right jwells!!
TO make it a little easier, I'll rearrange the equation to solve for the pickup resistance knowing the pot value and the total reading.
Rpu = 1/(1/Rt - 1/Rvol)
Where:
Rpu = pickup resistance
Rt = Total resistance (your measurement at the output jack)
Rvol = volume pot resistance
Remember the pot will not be exactly 250.00000K or 500.000K. They vary a lot.
Also, capacitors are open circuits to an ohmmeter, so tone circuits will not affect the measurement.
I'm not sure if anyone mentioned it, but you will need to turn the volume control all the way CW for this to work too (except Fuzzy's way). Fuzzy's way is the most straightforward, unless you
don't want to take the control plate out. Then you can resort to the calculated method.