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Sounds like yet another bad ground in a 740 instrument panel. I'd guess that the little bit of extra juice from the system trying to turn on the seatbelt warning light, is causing a flaky ground to act up. If you aren't having other instrument-specific problems, I wouldn't go tear it apart to fix it. However if the cluster has to come out for other repairs, I'd go looking for poor ground connections to the flex circuit and wiring.
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Rob Bareiss, New London CT ::: '87 244DL/M47- 221K, 88 744GLE- 202K, 91 244 181K, 88 244GL 145K
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