28-03-2023, 08:27 AM
Hi Lowbarn
The 'shell' of the warning lamp holder connects to the three rivets. The uppermost rivet connects to an internal brass strip which runs vertically up to the central internal contact for the cam switches that select High/Low charge. This central cam switch contact also connects directly through to the external +D terminal.
If the brass strip was O/C the added blue wire would effect a cure, but removing it would prevent the lamp from illuminating.
Another possibility is that the through connection from the central cam switch contact to the external +D terminal has failed, and the blue wire is to cure this. In this situation, removing the blue wire will effectively connect the warning lamp between +D and F when High charge is called for. There may be enough voltage difference between +D and F to illuminate it. The dynamo will always be in the Low charge state regardless of switch setting, assuming it has a functioning Low charge resistor.
I have a half finished schematic for this, If I get time I will PM it to you.
The 'shell' of the warning lamp holder connects to the three rivets. The uppermost rivet connects to an internal brass strip which runs vertically up to the central internal contact for the cam switches that select High/Low charge. This central cam switch contact also connects directly through to the external +D terminal.
If the brass strip was O/C the added blue wire would effect a cure, but removing it would prevent the lamp from illuminating.
Another possibility is that the through connection from the central cam switch contact to the external +D terminal has failed, and the blue wire is to cure this. In this situation, removing the blue wire will effectively connect the warning lamp between +D and F when High charge is called for. There may be enough voltage difference between +D and F to illuminate it. The dynamo will always be in the Low charge state regardless of switch setting, assuming it has a functioning Low charge resistor.
I have a half finished schematic for this, If I get time I will PM it to you.