28-02-12, 09:39 PM
From what I remember is that coils work from a pulse from the cdi and when the rectifier goes it can't regulate the power from the alternator which then over charges the battery which sends to many volts through the wiring and blows a certain zenner diode inside the cdi which on the bike I was working on had actually cracked the coil and blew the rev counter as that wasn't cable operated with the over charge. Common on ER500's.
Each time I've seen this it blew one of the coils. Changed the coil and no spark, changed the cdi with a known good one and then had a spark. Ran the bike for second after the fix to see that the battery was showing 15v plus, changed the rectifier and voltage was back down to where it should of been.
Seen this a few times now, would always check this first, spent so many hours head scratching with wiring, its starting to make sense slowly.
Each time I've seen this it blew one of the coils. Changed the coil and no spark, changed the cdi with a known good one and then had a spark. Ran the bike for second after the fix to see that the battery was showing 15v plus, changed the rectifier and voltage was back down to where it should of been.
Seen this a few times now, would always check this first, spent so many hours head scratching with wiring, its starting to make sense slowly.