Compression Ignition Addict
Join Date: Aug 2007
Location: New Martinsville, West Virginia
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first off, try this question in the 7.3 general area, more traffic, specific to the 7.3. The box you discribe sounds like the PCM (Powertrain Control Module, I think), it mounts in the area like you said. However, the switch and the LED lights, I have no idea. An aftermarket tuner would attacht to the rear area of the PCM, but none I've heard of are just a switch/LED like you discribe.
Any chance it is a 'jake brake' control, there is a valve in the turbo pedistal that can be wired to act like a jake brake, retarding exhaust for deceleration use...
Good luck, sorry I can't be of much help.
'99 E350 DRW Stahl 11' util box van, 7.3 PSD, stock. 138k SOLD
'00 F350 extcab, 9' utility bed, dually 228k
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E'99 F250 extcab, S/Bed 211k. Sidelined due to motor issues.
'00 Excursion Limited, 7.3PSD 294k
'84 Chevy K-30, 6.2L TD, woods/trail beater. 141k