You need to go here and find the appropriate info:
http://www.oacdp.org/ebersp.html#f3I have reconditioned many BN2's both early and late so a few points:
- make sure all the wiring push on connectors are tight and making good contact. These connectors tend to be brittle and may break if you attempt to tighten them. Replace any that are required.
- you will need an excellent fully charged battery to get this heater to fire up.
- decent used parts are getting hard to find particularly the fuel pump.
- the fuel pump can be partially taken apart and cleaned. Here is a good tutorial. It is for a BN4 pump but the innards are similar. The pump part starts at page 2.
http://www.thesamba.com/vw/forum/viewtopic.php?t=614419&postdays=0&postorder=asc&highlight=bn4&start=20- you can test the pump by applying power to it. Hook up the ground and just touch the positive wire to the pump. You want to hear it click. Do it very quickly.
Do not apply continuous power to the pump.
You will ruin it. Oh and if it isn't clear in the diagrams the positive terminal on the pump is on the right when looking at the terminals from the discharge end.
- if you do not hear the pump click (it is a pulse pump so it does not run continuously) you will likely need to disassemble the fan housing and clean/regap the points as well as cleaning the pump noted above.
My thoughts for now.