Red is the high voltage winding, red-yellow the center tap. Typically, any solid color is one end of a winding, while that color with a stripe (usually a yellow stripe) is the center tap.
Here's the old color code, or as much of it as I can remember.īlack is the primary black with a stripe is likely a tap on the primary for an alternate voltage, such as 110v vs. Transformer color codes were pretty consistent and standardized in the 1940s, 50s and 60s, but have gone a little haywire since then, especially if you have Asian imports. If you KNOW that the primaries are 120v, and you know which leads the primaries are, then just hook the primary up to 120v and use your meter to measure the various secondary voltages.Īs to the color codes, first the obvious: same colors are the same winding.
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