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On a 740 it's in the fuse box. Remove ashtray and coin box/cig lighter to access it. Red cylindrical relay plugged into the left front of the fuse/relay panel.
Get a junkyard part or pry it open to re-solder. The failure for the brake lights seems to occur right on the top deck of circuit boards inside, right against the outer edge.
It's a fairly high-current connection in there- power comes in on one wire and leaves on two. It's the input wire but just look for the burnt connection. Fresh solder and it should be repairable. If not, a junkyard unit will work fine. They also appear on Ebay regularly.
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Rob Bareiss, New London CT ::: 87 244DL, 88 245DL, 90 745GL, 84 242DL project, 89 244 parts, 88 244DL to replace the 87
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