Basically you need to go at it with a multimeter set to ohms.
Between most of the colours and one of the others you should see a high resistance.
You might have a split primary transformer.
If you make up a table and measure RED - YELLOW, then RED - ORANGE, keep going through all the possibilities and publish your results, one of us will have a go at suggesting what you have there.
DO NOT connect it to mains voltage until we have advised you where to start.
Between most of the colours and one of the others you should see a high resistance.
You might have a split primary transformer.
If you make up a table and measure RED - YELLOW, then RED - ORANGE, keep going through all the possibilities and publish your results, one of us will have a go at suggesting what you have there.
DO NOT connect it to mains voltage until we have advised you where to start.
Draw a table (not a dining room table) but a grid of 10 x 10 boxes.
Across the top write RED, YELLOW, ORANGE, GREY, WHITE, BROWN.
Down the side write the same RED, YELLOW, GREY, WHITE, BROWN.
Then in each box write the resistance reading in Ohms.
Obviously RED-RED will be ZERO as will ORANGE-ORANGE.
Always use a low wattage bulb in series with the primary (or more correctly mains input as we don't know the primary) for testing and determining connections.
The primary windings will normally be thinner wire than the secondaries for transformers with lower secondary than primary voltages. ie, the sort we use on here
The primary windings will normally be thinner wire than the secondaries for transformers with lower secondary than primary voltages. ie, the sort we use on here
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