Intermittent lights on '07 electric Yamaha
 

The lights on my 07 Yamaha cart are very intermittent. The headlight switch has been replaced twice, so it is doubtful that that is the problem. The lights usually go out after the cart has been driven for a short distance and then after an undetermined period of time they will magically come back on again. The problem does not appear to be a loose or pinched wire as driving over bumpy surfaces does not cause any flickering of the lights. Could this be a problem with the voltage divider? Has anyone else experienced the same problem?

Intermittent problems can often be caused by poor connection or partially broken wire that lose their connection when temperature rises, such as after the cart has been driven a bit.

I had a similar problem, but mine turned out to be the switch. Check closely the wires that are attached to the switch. Good Luck!

I would look in the direction of the 48-12 voltage reducer being faulty.
Put the lights on for 15 min and than using a digital volt meter on the 12 volt side see if the voltage varies. If it does it most likely needs replacement.

As per your suggestion, I am monitoring the voltage at the headlight switch. When lights are off, voltage reads 13 volts. When lights are turned on, voltage drops to 11.8 volts. Also, when brakes are applied, voltage drops even further to 11.5 volts; add the turn signals and it drops to 11.3. Is drop from 13 to 11.8 volts normal, as this circuit does not seem to be well regulated? PS, the light haven't failed since I began monitoring.

Do you know what the sorce of 12 volt power stems from. Is it a direct supply form the batteries or is there a voltage reducer in the system.
If the is a voltage reducer it could be failing under load. The type of reducer that we use
Are 48/12/ 30 amp. This type unit is strong enough to supply the correct current and not decrease in voltage under normal loads. The rating and amps is usually printed on the unit.