Changing lights

I had an extension built and electrician fitted low voltage lights. Lights flickered so I changed them to the spot lights that worked direct from mains, with no need for a transformer. Changed most of them a year ago and then went to change the final 4 today. No problem with 3 of them as merely copied what I had done previously.
Got to the fourth, nearest the switch and it had a junction box with three wires. Disconnected the box without recording what connections were.
Looked at the various wiring diagrams on the net and worked out that the three reds needed to all be connected to each other. Closed off the three earths. Then turned to the three blacks. Guessed which Black came from the switch, connected this to the live for the light, and connected the other two blacks to the neutral for the light - guessed wrong so fuse blew.
Swapped blacks and this time lights stayed on permanently and switch didn't turn them off and on. Swapped blacks again and this time one light goes off and on when turn switch, but all other three stay on.
Any one any bright ideas as am running out of fuse wire.
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Paul wrote:

Do you *really* live where circuit protection using replaceable fuse wire links is still in use?
I haven't sen any of that kind of stuff in the USA for about 50 years.
A volt-ohmmeter would be a handy tool for you to to use, Paul. Can you beg, borrow or buy one? With one of those and a little knowledge/deductive reasoning you should be able to sort it out quickly.
If you want to spring for my travel expenses I'll bring my meter and do it for you. Gawd knows I need to get away for a couple of days....<G>
Jeff
--
Jeffry Wisnia

(W1BSV + Brass Rat \'57 EE)
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