Sorry - just noticed your mention of electric brakes. What on earth are electric brakes? I don't think we have those in the UK
Thanks anyway Jeremy. All suggestions welcome!! I can't change the bulbs because I pull these trailers with my dually too. One of them has 16 lights so it would be a pain.
Electric brakes are pretty common here in the USA. They are used on a lot of trailers under 10,000 lbs. Basically, they use an electromagnet in the drum to actuate the shoes. The controller (in the cab) regulates the voltage. More voltage, more braking. It is a pretty simple system.....until you are on a single lane highway in the middle of the night & it does not work!