29-08-2022, 12:07 PM
Today, SM5 switch panel taken off and at first glance, no obvious problem. Stripped it down - Removed the 2 x 4Ba screws holding the ammeter terminals onto the ammeter. Removed the 2 x round 2Ba 'nuts' on the terminal posts of the switch levers. (These were originally locked into place with solder, but this had been removed by a previous owner). Removed the 2 x 2Ba nuts holding the Bakelite terminal plate to the front bakelite plate.
Contacts cleaned etc - but no real problem found ???? Backtrack a little.
How does the electricity pass through the switch ? Researching this I concluded that there was an intermittent connection between the 2Ba round nuts, the brass "bus bar" and the steel posts which connects to the moving contractor of the switch lever. Further investigation showed that there was a corroded aluminium washer beneath the 'round nut'. Lets hope that is the problem !!
Ps - The blue wire is in place of the resistance wire wound around the ignition light - I assume the light is probably 9 or 12 volt. I Darednt remove it as it is well and truly stuck in and it has worked for me for 25 years.
Contacts cleaned etc - but no real problem found ???? Backtrack a little.
How does the electricity pass through the switch ? Researching this I concluded that there was an intermittent connection between the 2Ba round nuts, the brass "bus bar" and the steel posts which connects to the moving contractor of the switch lever. Further investigation showed that there was a corroded aluminium washer beneath the 'round nut'. Lets hope that is the problem !!
Ps - The blue wire is in place of the resistance wire wound around the ignition light - I assume the light is probably 9 or 12 volt. I Darednt remove it as it is well and truly stuck in and it has worked for me for 25 years.