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Are the tumblers broken? Key won't turn in the barrel?
or
Key turns but starter does not engage?

If it is the latter then you may want to read this thread.
Twitchy ignition revisited - 1989 V6


Once you know your main battery cables are good, IMHO this is a nice improvement over stock. The factory runs a lot through the ignition switch and if your adding extra loads, the voltage drops can cause problems.

An alternative to running all your loads through a relay is to just separate out one or two of the larger one. The first one that comes to mind is to separate out the directionals / marker lights or see if LED bulbs with an electronic flasher would reduce draw and still flash.

The rear defroster is another candidate.

87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...