I was just curious to see when Dodge changed the dash. I knew the '89 trucks had a different gauge cluster than my truck, but I wasn't sure if the '90's had the same one as well. That's why I wanted a picture.

Thanks for the picture Jimbo.

 

Sometime in the 90 model year, they switched from a 100K to a million-mile odometer. My 90 had the latter; donor rig I hauled for bgilbert had the 89-style set up- cable and 5 digit odo. Both had Getrags.

 

The ABS controller is behind the glove box. But the rolls connector is mounted over by the hood release. You need to hook one wire to the "input" and another to the "sensor ground" terminal on the converter box. You can get power from the fuse panel.

 

There is no Distance Sensor pulse count info in the regular FSM, they refer to a Vehicle diagnostics manual and I don't have that one, yet...

I am looking at the 90' FSM RWABS wiring schematic now. Dave has the wiring info correct, the twisted pair is the rolls connector, colored as he stated, red/violet and wht/violet.

The round elect. connector, 11 pin I believe will have a dark blue wire that is 12v feed. If the connector is labeled it is "d"

 

ok i found the "rolls" connector you guys mentioned. what is that plug ever used for if it just sits there with nothing plugged into it? and how do i find out which wire is the input and/or ground wire? and what circuit in the fuse block would you suggest getting my power from? obviously something that comes on with the ignition on.

 

The factory used that plug to make sure the sensor was generating a signal, that's it.

Just pick one, it's an AC generating circuit.

Power windows is a good place for key-on power.

 

I have both 1989 and 1990 Automatics and they both have mechanical speedometers. My 91 and 1/2s and 92s all have electronic speedos and they seem to expire at an early age in the Texas Heat. All my trucks have automatics.

 

My crew had a 89 donor, so it's a cable off my 96 NV4500 to the 100K speedo.

 

Perhaps its to late to help, but... I've been working on fixing the accuracy of the electronic speedo in my 90 D350 cab/chassis project due to a gear change to 3:54's from 4:10's and an increase in tire diameter. I found an excellent speedo shop here in Tucson and according to them the signal generating component on your trans is in fact a pulse generator. According to them american manufactures use a standard 1000 pulses per mile. European manufacturers differ among themselves and none use the 1000 pulse per mile standard. My only complaint is that real accuracy is not obtainable. Currently the speedo is very accurate from 50-100 but fast (3-5mph) from 0-45. I also tried to correct the accuracy of the mechanical speedo in my 89 d250 SRW pickup and found the same situation. Speedo shop says this inability to correct speedo reading throughout its full range is normal and that I need to learn to live with it. Accuracy was important to me due to radar speed cameras used in this state.

 

i mentioned using the signal from the RWAL sensor in the rear-end to a local speedometer shop here and the guy told me that ABS systems typically give square waves. i don't know if when explaining my situation to him he thought i was going to run wires directly to the speedo from the sensor or what. but i think i could try the converter box hooked up to the rolls connector at the brake release for a signal. and if that doesn't work, i'll add the magnets and pickup to the system.

 

There are digital Speedometer Recalibrator you can buy that can correct the pulse count.
http://www.sporttruck.com/techarticl...max/index.html

Wonder how the accuracy of the Certified Speedometer in a police cruiser compares to the ones in our truck?

Jim

 

New spin, 92 D350 Getreg 4:10,,, speed-o not working, has a 90'/33% reduction and sensor (?). When testing the there is no voltage but the risistance is iratic and in a 40 to 70 ohm range. Is the sensor bad? Also, the RWAL sensor isn't hooked up. Any relation to the speed-o operation? My first D350, love the style now I need to get her right.

 

I'm not sure if this helps but I had my VSS and a few inches of the plug-in wires out on the bench. Twisting the VSS shaft with a drill I got no ac or dc voltage, nor any dc current. What I did get was a fairly consistent 8 to 12 ohm (or meg-ohm whatever) reading on my digital multimeter. I don't know what that sigifies except that I decided (correctly as it turns out) that the VSS was OK and water was my latest problem. Jim Lane might explain this, but my electronics savvy is pretty limited. I've often cursed this bastardized system and wished I had a speedo cable as mentioned in previous posts, ....

 

Rwal system has no interconnection to speedometer/odometer system circuit. I checked my 92 shop manual for correct diagnostic procedure and it refers me to another specialized factory book called the Vehicle Diagnostics Procedure Manual which I don't have. from experience though I can say that, typically, if your speedometer quits indicating completely the "distance sensor" as the factory calls it, or pulse generator on the trans is usually the culprit in automatic equipped trucks. This is especially true if you can confirm that your wiring is good. however, because you have a Getrag, you also have 90 deg. drive unit on there. These units both reverse the rotation (since Getrags speedo drives are driven from the top on the trans output shaft where chrysler are driven from the bottom side of output shaft) and correct for ratio. I have seen many of the mechanical units with stripped driveshafts in them. These drive shafts are 1.25 inches long with a hex on one end and the typical .125 square speedo drive on the other. This driveshaft is accessed by removing the pulse generator (VSS as you call it) from the 90 deg. drive box. I find this stripped driveshaft more commonly than a bad pulse generator (VSS) on Getrag equipped trucks.

 

THANKS for info. Good stuff, SO----the system didn't have the short shaft between the trans and 90/ratio gear, made one and every thing turns now.

So the resistance on the pulse gen should be around 8 -12 ohms. This was surpose to be a new pulse gen but the resistance I get, trans in low gear at an idle and resisatance was over 44 (+) ohms and very irritic to over 60 ohms. Just spinning by hand propduced nothing, voltage or ohms.

I'm trying to trace the system but have not found a wire dirgram and as we all know all wires look the same. Attempt at humor. My next step is getting the wiring in order, this should not be hard as the truck was not all cut up.

The only other question I have is concerning the relationship to the cruse control. The control buttons are broken/missing from the steering wheel, broken off. I have all the stuff to replace, so, should I not worrie until I get the speed-o working or should I replace this first.

THANKS Guys for all the help.

I love my truck but I think the wife loves it even more! This style over a '96' we looked at.