Start to trace wires at the back of the board?

Start at the device trace wiring back to the point they connect to the Battery's positive cabeling. The two probably meet at or near the fuse box. Telephone people have a wire traceing device like this: http://www.ebay.com/itm/MASTECH-MS6812-Network-Cable-Wire-Line-Phone-Telephone-RJ-Tracer-Tester-/191501729776? t=LH_DefaultDomain_0&hash=item2c96647ff0 It has a transmitter you would attach to the wire feeding the horn it generates a pulse on the wire you want to trace and a reciever with which to follow the wire. You may be able to find a bad "master fuse that serves these three function. Sometimes they are near the battery and positive wires going away from the battery.
hope this helps.

I had the same problem and I traced mine out to circuit board that is behind the fuses. I fixed 2 bad wires on the board and lights are on again for me; other wise I would have gotten out multimeter to trace wiring to find problem.

This is for sure a short issue. It could be where the fuse is seated but not the whole fuse board. With low voltage there is no magic other than tracing the wiring back from the problem to the source point and checking each connection until you find the short/grounding problem.

This sounds like the X-files "electrical gremlin" that these vans are infamous for. I'd start with the wiring harness connector pins on the back of the instrument cluster. Earlier versions of this van have had copious problems traced back to this issue. Just re-solder the pins on the circuit board (my 98 Voyager has 13 of them) and this may solve the problem. If not, then there is likely some other electrical connection issue somewhere along the wiring harness. Others have traced the problem to the connectors on the heater and A/C controls on the middle dash panel. I suspect similar problems on my own van are likely located in the block connectors under the dash, or possibly old/worn/brittle wires somewhere in the engine compartment. Just spend a few hours tracing wires from your dash and making sure all connections are tested, secure, and functioning. This can be time consuming, but it might be the only way to avoid excessive/prohibitive mechanic rates! (I'll be diving into my own van's wiring tonight - while the weather is still warm)

If it's just the Temp/ Fuel gauge,,, my money is on the instrument voltage regulator. (it governs the voltage to these gauges regardless of the incline (up/down for the fuel gauge) or the battery voltage 12.5 - 13.8 . Other than these it may be an earth connection problen (long shot) because the instrument panel relies on many many signal imputs. !

You have a short in the wiring somewhere. Trace the wires back and locate the wire that is grounding. It is most likely the one that melted so start by tracing that wire and if no shorts are found trace the others back.

Check the circuit board on the back of the tail light. Comes loose from the taillight with the screw at the top and bottom. I've replaced many many of them. Interchange with, Tahoe up to 98, suburban, 1500, 2500, full size blazer...

You are looking for a bare spot on a wire. When the glow plugs are powered up the system is shorting out. Start tracing wires. Work back from the glow plugs to the relay. If its not there, you'll have to start tracing the wires from the relay to their destinations. When you find it, tape it up and reposition the wire so it won'trub again. Hope this helps.

bad wire.trace wiring from Alt. to battery and starter wiring sometimes burns

that is a double sided pc board.you need to take the pc board away from the cluster,and check the reverse side of the plugs for a broken ground.