Disconnect the sending unit wire from thew sender when its cold. If the fuse still blows the the tcs vaccum soleniod is bad,if it doesnt then the sender is bad. You should have ignition power there when the key is on. The sender on the trans puts the ground in when you shift to 3rd and 4th gear. What I did on my 70 was to disable that system and run ported vaccum to the distributor. The car runs alot better this way also. Hope this helps you Carl
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