I have a Maxus that had exactly the same faults as yours..turn on the lights and a small relay near the fuse box would buzz violently, indicators intermittent, dash lights and guages on the blink.I thought it was the etacs unit behind the stereo, so I bought a s/h unit and butchered my dash to get at the problem. Having taken out the old black box, the insides seemed to have one more relay than the new box, but what had I to lose? I exchanged the units over and it the wipers began to park themselves properly, but the buzzing was still there with headlights on.(I'd replaced the small relay near the fuses to no effect).
Now to get at the etacs unit i had to remove the radio/cassette player (the original radios are notoriously bad). Now it looked as if, when someone was installing the stereo, they'd managed to losen off an earth wire that was left dangling. with the stereo out of the wayI touched the lose wire onto the nearest exposed bodywork for a decent earth...
...hey presto, the buzzing when the lights were switched on ceased, the electric windows started to work again, the rev counter settled down, the fuel guage became less random, and the dash lights even woprked properly again. For a brief moment the orange warning light disappeared, and all on the dash was fine(bar the clock that always lost an hr a day)
since then my heater fan has decided to stop working(it only ever span at full speed or nothing), the fuel guage reads full on ignition then settles down to a more realistic reading after a couple of miles. I've not got round to replacing the stereo, as I'd rather be able to get inside the horrible wiring easier in the future if I have to.
I suppose if i got the relays within the ETACS unit replaced that might make the heater fan work, and the intermittent wiper mode to come back to l;ife. but as is, I put up with it's niggly electrics, so long as the grunt under the bonnet isn't playing up.
They were cheap vans when new and i think you gets whats you pays for.
I'd love to get my heater working on all 4 speeds, so if anyone has any ideas, please let me know.
Also, I've lost the grey plastic cover from my interior fuse box, and can't tell which fuse is for which component (..I wanted to check the one for the heater fan). If anyone could take a photo of the fuse box layout and post it to me I'd much appreciate (mothila13@hotmial.co.uk)
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