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Check the amp gauge as said.They burn and do all kinds of weird stuff.I eliminated every one in the 4 70s trucks I had.One did what yours is doing.I just installed a volt meter in them.My 83 also had a burnt up ignition switch at the bottom of the column.Rocky



that's the first place i go too. you will find it a nice shade of toasty brown and black. the terminals should be melted right into the plastic cluster too.