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I am doing some work on the electronics of a guitar and in doing so was testing some old circuitry.

I noticed that there are two resistors each stamped with ‘223’. When checking the resistance of these two components I received the following:

resistance 0.735m resistance 251.2k

I know one is K and one is M. There is still a variance of nearly 500k between the two. Why?

Is one of the resistors bad?

edit On closer inspection these may be capacitors

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    \$\begingroup\$ Have to be careful making measurements like that in-situ, as other parts that are connected to the part you're trying to measure could influence the measurement. \$\endgroup\$
    – SteveSh
    Mar 15, 2020 at 15:01
  • \$\begingroup\$ Those are ceramic capacitors, 223 would be 22 nF. The resistance measurements come from everything else in that circuit. \$\endgroup\$
    – user16324
    Mar 15, 2020 at 15:04
  • \$\begingroup\$ There’s nothing else attached to the end of the circuit \$\endgroup\$
    – Barry Chapman
    Mar 15, 2020 at 15:04
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    \$\begingroup\$ I see a solder sucker on that blanket, if that guitars older than the 2000s it most likely has lead solder. at which point you're going to be getting lead dust everywhere if you're using that solder sucker. \$\endgroup\$
    – MadHatter
    Mar 15, 2020 at 15:34
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    \$\begingroup\$ Photo isn't quite clear enough to be sure, but it looks like the left-hand (as we look) pots are tone, right-hand ones are volume. The capacitors are in series with the tone pots to apply a variable amount of treble cut. I think the ground end of the pot is grounded to the case, then perhaps the case is grounded via the mounting plate, assuming it is metal. (If it's not metal, there appears to be no other grounding for the pot so this may be the fault OP is searching for). Hard to tell from the photo. \$\endgroup\$
    – peterG
    Mar 15, 2020 at 20:14

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