If everything was working before and now it doesn't, it leaves you with 2 options
1. everything burned out - you tested at least one of them and it lite up so that isn't the case
2. a connection/s lost connectivity - you need to trace everything and examine the connections, however my first top would be the connection at the bulkhead inside the engine compartment (should be a block of 4 wires on one corner of the bulk head).
Do you have a power probe? If not, I highly recommend getting one, it will make testing many times easier than without.