Question about 1993 Dodge Ram
I am no expert on this but have the same problem. Here is where I am at. I bought the truck used, needed a new PCM which after installing one from a gas job and verifying that wiring was good, bought a reman from Chrysler. Speedo still did not work even though it did with the gas PCM but was fluctuating allover. Chrysler replaced PCM and speedo started to work intermittantly. Took truck into dealer and $600. later told mechanic thought it was faulty PCM. He called Chrysler and asked them to pull one from the shelf and test. They said needed a new crankshaft speed sensor.Mechanic took truck on the road, shifted into nuetral then turned ignition back on, speedo works. Replaced crankshaft speed sensor and situation didn't change. Total spent $1000. and no speedo and no overdrive. Speedo started working intermittantly, seemed like depending on transmission temperature. Friend that works on dodge said is instrument cluster. tried another cluster still the same. Replaced ignition switch, thinking that may be the problem. Still the same. Bought a new Neutral starting switch, which I have not replaced as of yet. If I place truck in neutral and start the truck speedometer is activated right away but does not stay. So right now am down to two scenarios. The neutral starting switch or,...... the temp sensor in the oil line. Feeling is it is the neutral starting switch. By the way had already replaced speed sensor in tranny and rear end. Going to replace neutral starting switch, cost is $25. for the part and see what happens. Please keep us posted, as others are having the same problem.
Posted on Jan 23, 2010
It's a fusible link, I did most of the same stuff and in the end it was just a burned up fusible link
Posted on Jan 09, 2017
This is what I have found on my 93 Dodge w250, 4x4, diesel, auto
I have been through all of this MULTIPLE times. When all your gauges go crazy and the ALT gauge shows it is not charging...it is the main brain. I have to replace the brain in my truck usually once every year or two. I pull it out, ship it to someone in Texas, he rebuilds it, and it works great all over again. One thing I found is DO NOT use your trucks battery to jump start ANYTHING. This will cause failure in the brain.
As to the problem of speedo and overdrive coming in and out. This is caused by a faulty speed sensor located on the transfer case. DO NOT buy crappy aftermarket ones. Once again, every year or two I have to buy a new speed sensor direct from Dodge.
Posted on May 13, 2013
I have a similar situation with my '93 Dodge diesel except except my speedo, odom and battery charge gauge work in tandem intermittenly. The result being that the truck seems to work solely off the battery of course losing its charge. Still searching high and low for a loose ground.
Posted on Mar 11, 2011
I am having similar problems on my 91 ram 350 5.9L Cummins. Slipping out of overdrive, speedometer works most of the time but will wiggel wildly occasionally. Rebuilt tranny, no luck. Replaced throttle position sensor, no luck. A friend told me it could be the Coolant Temperature Switch, connected to the tranny. I bought on from Dodge and am about to put it in. Will let you know how it goes.
Posted on Apr 15, 2010
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Posted on Jan 02, 2017
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