Originally Posted by
tommywpg
I don't know where to test the generator with both probes as the gen only has one contact.
The second contact is provided by the screw that makes contact with the bike frame (these units assumed an all-metal bike frame), so putting one probe anywhere on the metal case and clamp of the generator and the second on either wire to the lights will work.
But the real test is whether it lights up the lamps adequately. Replace the burned out bulbs and see how well it works.