I changed the relay, still nearside interior lights not working, any other suggestions Roy?

My bus number (if any): RML 2353, MB 306, MS 1103

Check the connections inside (but might be above or behind!?) the canopy blind box, seen it cause the same problem a few times in the past.

I'll have a look at the wiring diagram. Does the relay have a feed from the alternator field wire when the engine is running? You should have 24v across the coil connections. when the relay energises, it switches 24v from the light switch to the lights. Check 24 v from the switch to the relay.

The alternator feed I think runs under the floor to the rear offside long seat, maybe following the battery cable route then up a bit of trunking inside the saloon to the conductors box.

My bus number (if any): RML2532

I think it may be the switch, as I got them to work last night!

My bus number (if any): RML 2353, MB 306, MS 1103

Oh good. :)

My bus number (if any): RML2532