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Old 09-27-2012, 09:55 AM   #1
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Join Date: Aug 2011
Posts: 23
Diagnostic connector -99 Diplomat location ?

Does anyone know where the Diagnostic connector is on a 1999 Diplomat with 5.9L is located and what it looks like and how many pins it has and any color of the wires ? I want to connect up a Silverleaf VMSpc to my motorhome to monitor parameter. I found one in the left accessory bay but when talking to silverleaf they said it was under the steering column and I needed either a 6pin or 9 pin or 12 pin connector but I had to find out which I had.

So someone please help find what I am looking for, and wire colors to verify I am looking at the right connector.

Ga Camper

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Old 09-27-2012, 12:56 PM   #2
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Location: Foley, AL
Posts: 1,247
It will either have 6 or 9 pins and is round. See the picture below. It should be somewhere near the driver's left foot but may be hidden in a wire bundle. Could be stuffed inside the panel beside the driver's left foot or inside the steering column surround. Just have to dig around for it.
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2001 Monaco Diplomat 40' PDQ - 08 Honda CR-V
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Old 09-27-2012, 03:30 PM   #3
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Much Thanks goes to Rex !!!!


There are not enough words to cover how much "THANKS" I want to give you !!! I had looked on both sides of the steering column before you gave me the details for left side and a photo of the connector. I did not know if I was looking for a square plug or round before.

With your info I was able to go lay down in the floor and look under the dash and find the connector in less than 5 mins.

For a first time diesel pusher owner you saved the day !

Again I can't say "THANK YOU ENOUGH !!!

Ga Camper
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Old 09-28-2012, 08:45 PM   #4
Join Date: Feb 2012
Location: Colorado Springs
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Does any one know if the 91 Monaco Crown royal DP have a trouble shooting plug? It is the L10 series eng.


91 Monaco Royal Signature DP
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