Power window wiring weirdness

Hi,

I have a '72 Dodge Coronet Custom Wagon with a problem in the power windows. It has 4 power windows that only work when i hotwire the power lead. I have been able to trace the cable for the power to a relay that's attached to the main fuse box (see picture). This relay doesnt give power... I think it's the horn relay? I can hear it switch whenever i press the horn. Also, when i make it switch by putting power on the blue/white lead, the power windows do work.

Does anybody know what's going on here?

I have enclosed a picture of the relay. Its the one hanging below the fuse box with the thick red wire.

regards. Willem

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