I have a 1987 F150 with 67000 original miles and live in the hot and muggy climate of Florida, just bought the truck where it was up north all it's life. I replaced the plugs & wires 2 months ago, the battery 1 month ago, alternator about 3 weeks ago, the TFI module 2 weeks ago, and now the volt gauge on the dashboard indicates a low charge, not sure what this is yet. The guy at Discount Auto parts checked out the battery and the alternator, which are both fine. Am I just running into bad luck or could there be something causing all these electrical problems?