Electrical fault loss of all power

[vw_mad]

Have been trying to start van today was going ok until I tried to turn on the lights the first pull was fine but when I pulled it out fully everything went off dash lights radio clock alarm interior lights and if I turned the key nothing . Took battery off checked fuses which are all ok apart from 3 rd from right which had melted the end of the fuse but still not blown . Connected battery back up and clock ,radio etc all started as soon as I connected battery pulled the lights which out fully and again all power gone.
Checked voltage on light switch has 12v on no. 30 but when I pull out the switch it goes to 0v
Could it be a faulty switch or problem with fuse board .
Have tried checking wiring diagram but it shows 10 fuses but I have 12

It's a early 1970 bay UK RDH.
Any info or wiring info which I can check through would be great
Thanks

 

[vw_mad]

Just found a wiring diagram off vintage bus which makes much more sense.
Just got to figure out why I loose all power on no.30 on light switch iginition and flasher relay ,feed to fuse 1& 2
Any ideas !!!!!!!
Bloody things in the garage now until I have lots of info to check wiring

 

[Peter Good]

From your description it could be a poor connection in a number of places. My favourite for checking first of all is the starter motor large stud terminal on the solenoid with the main battery lead and usually a couple of other smaller cables. Disconnect the battery and remove the M8 nut then make sure all the connections are clean and bright and I suspect you will be motoring OK.
Peter Good

 

[weeboll]

check your headlight bulbs, filament blown on one could have dropped across the other filament creating a short. happened to me and was a right bugger to diagnose on the roadside

 

[vw_mad]

Will check the lights good point
The cables to battery and starter are all good as just had new starter so they all ok .
Going to try and see if I can look behind fuses to see if any loose wires etc as well