Percy, one possible trouble spot. The placement of that black box under the center armrest: one guy put such a box at that point, and when he also velcro-ed a CB radio on top of the armrest and keyed the transmitter, the box shut off from induced voltage! And since it was an intermittent failure (only happened when the transmitter was keyed), it took weeks to find it.... I don't know whats in your black box nor if you use CB radios, but it can happen if things line up just right.
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