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Old 08-05-2013, 08:15 PM   #1
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Diagnostic Plugs

I have a 1996 1/2 Rexhall RollsAir RA3400 with a mechanical 8.3C Cummins and a 6 speed Allison trans. I would like to know what information is stored in my "computer memory " if any? or are these plugs for something else and if so what???? I will try and post a photo.
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Old 08-05-2013, 08:30 PM   #2
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I am having trouble posting Pics. I have uploaded the pic twice and I don't know where it went
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Old 08-06-2013, 05:28 PM   #3
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The plug on the right in that photo looks a bit like an OBD-1 jack. Not much is stored in OBD-1 but what is there can be fairly easily read.. Been a while since I did it though so I'd have to send you to the manual to figure it out.
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Old 08-06-2013, 05:51 PM   #4
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Never saw a1996 Cummins 8.3 electronic, if Cummins had the ISC 8.3 the plug in would use a 9 pin. I think
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Old 08-06-2013, 10:21 PM   #5
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my 96 with an 8.3 has both plugs...and the only computer/smart box is for the allison.....my engine is mechanical
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Old 08-07-2013, 07:16 AM   #6
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So have you ever tried reading the data from either plug? Are they both related to Allison?
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Old 08-08-2013, 10:01 PM   #7
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Joe, No I have not....I have had no reason to (knocking on wood)
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