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Reverse indicator not showing on dash

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I have a 2012 Mack CXU612 that, when put into reverse, won't light up the R indicator on the dash and neither the alarm nor the backup light comes on. I've checked fuses on top of dash and on firewall but no luck finding a bad fuse. On my fuse diagram it shows a reverse signal relay installed behind the IC (instrument cluster?) but I can't find it. Any help?

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look on top of transmission for the switch....easy stuff before you tear it up

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Found the switch but won't be able to get a new one til tomorrow. I'll report back tomorrow with the results. Thank you.

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