I ordered a new ignition coil for a Suzuki SF413 from a local seller. While I wait for that one to arrive, here are some resistance measurements for the stuff I have, with the resistance of the testing leads (0.4Ω) subtracted where significant.
NGK Spark Wires
Coil to distributor wire: 1.34 kΩ
Spark plug wires:
Seiwa Spark Wires:
Coil to distributor wire: 334 Ω
Spark plug wires: 608 Ω, 553 Ω, 576 Ω
Original coil that came with the car, Suzuki 33410-70G0, Denso 100297-0761:
(Turns out this is a coil from a JA12, also compatible with the SF413. The correct part number for the original JA11 ignition coil is 33410-841V0. This supercedes Suzuki 33410-84111, Nippondenso 029700-6431.)
Primary: 1.2 Ω
Secondary: 4.6 - 5.6 MΩ (corrosion on HV terminal)
Denso/Toyota 12V oil-filled coil I'm using right now:
Primary: 0.6 Ω (corrosion on terminals)
Secondary: 14.3 KΩ
New NTC 3694 Dry Ignition Coil for SF413:
Primary: 1.1Ω
Secondary: 25 KΩ
Update 12/14/2023 - Service Manual Specifications
Primary: 1.48Ω
Secondary: 12.6KΩ
Denso K16R-U
4.0 Ω, 9.5 Ω, 9.4 Ω (wtf?)
These were very cheap plugs, Rs. 250 each, so they're probably fake. I don't understand the extremely low resistance.
Denso IW24
5.67 kΩ, 4.9 kΩ, 4.68 kΩ