Apart from the bad earths I fixed recently, last night I found that the wire coming off the positive terminal (earth) decided
to become loose in its circular spade connector. Unbelievable! That alone would cause bulbs to blow and the engine would possibly misfire. While the cable was intermittently disconnecting over bumps etc, the full AC output of the alternator would be going through the bulbs and also possibly damaging the ignition coil.
Today I decided to fit a new rectifier even though original one
measured fine, but was starting to become loose on its central stud.
I then tried running the bike with the new rectifier installed and with lights on main beam. Even though the rectifier can handle up to 35 Amps peak it was getting pretty hot. A heat sink was obviously required. One was duly cut to shape and before being bolted in place some heat sink compound was applied to assist in the cooling process.
Initial tests seem to confirm that the fault that was
causing the bulbs to blow might have also damaged the ignition coil. With a new coil fitted the bike did not
manifest the same misfiring and cutting out fault that was apparent when the old coil was still in situ. We'll know for sure when the bike is taken
for a good run.
Watch this space.
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