Post
by Dr. Frankenstein » Tue May 02, 2017 3:49 pm
OK, an interesting development: as mentioned previously, I tested my coils according to the video link that Seadog sent me, and based on that video it indicated my coil was bad.
I was doing some reading: How To Troubleshoot, Repair and Modify Motorcycle Electrical Sysytems by Tracy Martin, and in the Ignition Systems section (page 64, if anybody has it) he details how to test the Primary and Secondary coils on a dual plug coil, which in this case is the OEM coil on my Dream 305.
(1) Switched the multimeter to 200 Ohms and tested the Primary leads coming off the OEM coil by placing the test leads directly on the connectors: 5.2 ohms.
(2) Tested the Secondary coil: I switched the multimeter to 20K ohm and applied the multimeter leads directly to the two spark wires coming out of the OEM coil - 17.50 ohms.
(3)Switched the multimeter back to 200 Ohms and tested the plug caps(NGK 5k Ohm caps) - 4.85 Ohms
Now here's the interesting part: Reattach the caps to the plug wires and test the Secondary coil as in the video: Nothing! All I get is the "1" reading, which (according to the video) means my coil is probably bad. Tried switching the leads: nothing. Same "1" reading/Infinity.
So, who to believe here...? Or am I just an idiot and can't read my multimeter right? Are there resistors in the caps? I haven't checked yet, but my '78 CX500 had them and I had to replace those when I rebuilt *it...
Bottom Line Question: Why does everything appear to test correctly when tested separately, but put them together and I get nothing?
