Hi, bike starts fine but cuts out as soon as I turn on the lights,
When running only the brake light works and gets brighter the more revs I give it
I suspect the battery is on its last legs as well, the lights do come on without the bike running
But very dimly!?
What bike?
1970 starfire
You really need to establish voltages to start your diagnosis and understanding.
Using a meter check battery voltage, nothing on.
Then check voltage when it's running.
If you unsure of the battery, then you must charge it first , prior to any checking of charging
Is your alternator working? I had to replace the whole unit on my C15 because the stator was a different size to the new style ones. :(