SOHC.co.uk Forums > CB500/550

Ignition coils

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JezzaPeach:
Strange, both meters show the right ohms for the secondary side.

deltarider:
The coil has two circuits: the primary and the secundary. The primary should read between 4 and 5Ω, so you select the 200Ω range for this. The secundary circuit of the coil itself, with plugcaps removed, should be between 14 and 15kΩ. To measure [...] select the 20kΩ scale. Which means: after measuring the secundary circuit, you'll need to select the 200Ω range for the primary. Did you?

JezzaPeach:
Many thanks. I tested a spare resistor plug DR7ES and got around 5 ohms using the 200 ohm scale.
Doing the same on the 2 small coil input leads get zero on each of 4 coils. Very odd.

deltarider:

--- Quote from: JezzaPeach on April 08, 2022, 08:25:19 PM ---I tested a spare resistor plug DR7ES and got around 5 ohms using the 200 ohm scale.
Doing the same on the 2 small coil input leads get zero on each of 4 coils. Very odd.

--- End quote ---
Very odd indeed, a DR7ES should read 5kΩ. In the 200Ω range it should produce a I, indicating the resistance is beyond the selected scale.

JezzaPeach:
Sorry I misread your instructions. All clear now. I was confusing the 200 with the 200k
🙄

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