Motorcycle Repair: mot, light sockets, lamp bulbs


Question
hi i have a moped and it just when through its mot. the bike shop i tock it to was supposed to fix the indicators but didnt yet it still passed its mot. i wanted to make sure its safe and legal cos if not i think i need a new mot just to check thats all that wrong

the indicators relay wire is breaking and the lights ither come on and then straight off or dont come on. if they do come on for for a long period they flash with the revs im realy unsure about all this i think its down to the CDI unit or something please help

Answer
Spencer..... not a lot of info to work with, but I can come up with a general answer.

Indicators are a separate lighting system, apart from the CDI ignition or the charging system. I don't know what brand/model/type of moped you have, but most indicators are battery-powered, not just run off of a lighting coil in the magneto. The battery needs charging from the charging system, but the battery has to be serviceable and fully-charged in the beginning.

Indicator system power flow:
Battery-ignition switch-flasher-indicator switch on handlebars-left/right side indicator light sockets-ground.

Any openings or loose connections will halt proper operation of the system. When lights fail to flash repeatedly, usually the problem is low voltage to the lamps. If power is present at the switch and lamps, then the lamp base grounds are suspect. It needs to be a complete circuit, starting with the battery + side and finally finding the complete path to chassis ground.

Check all lamp bulbs to see that they are the correct voltage and amperage/watt ratings. Test battery for fully charged state. Clean and tighten all wiring connections. Ensure that the charging system is fully operable and keeping the battery charged. Make sure that neither of the front/rear brake light switches are being triggered before the brakes are applied, which will rapidly reduce the battery voltage to the indicator system when the brake light stays on all the time.

Bill Silver