How to tell which impedance wires are what ohm?

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Cap217

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How do I tell or measure to see what wire on the impedance selector is for what ohm? This is for a marshall 4-8-16.

I thought I’d I used a multimeter and measured ohms I’d be able to tell but everything reads around 1 ohm.
 
Cap217 said:
How do I tell or measure to see what wire on the impedance selector is for what ohm? This is for a marshall 4-8-16.

I thought I’d I used a multimeter and measured ohms I’d be able to tell but everything reads around 1 ohm.
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You cant read it like that. You need to figure out the leads on your OT. Look up your transformer and see which color is which.
 
Yep. Lots of info on metro forum, Marshall forum etc about which color is which
 
Depends on your impedance selector style but visually you should be able to see where the pins connect if it's an older amp. A schematic should list colors and impedance.
 
Multimeter is useless in this scenario.

Two ways - either find the schematic for the transformer, which is usually difficult, or remove the NFB wire and alligator clip to to each terminal to see what's what. It's easy to tell that way. Darkest and smoothest 16ohm. Most open and bright, 4 ohm. 8 ohm in the middle.

A lot of Marshalls are 16 ohm green, 8 ohm yellow and 4 ohm black. But you can't use that as a definitive guide. Plus, colors changed depending on transformer.
 
RedPlated said:
Multimeter is useless in this scenario.

Two ways - either find the schematic for the transformer, which is usually difficult, or remove the NFB wire and alligator clip to to each terminal to see what's what. It's easy to tell that way. Darkest and smoothest 16ohm. Most open and bright, 4 ohm. 8 ohm in the middle.

A lot of Marshalls are 16 ohm green, 8 ohm yellow and 4 ohm black. But you can't use that as a definitive guide. Plus, colors changed depending on transformer.
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Yea, this one is grey, yellow, green. Judging from the current sound I think yellow is 4 but I need to just experiment.

Amp is a 74 50w/
 
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