215_12v

Hawkez- no check engine light, I haven't scanned it with the scan gauge but when I get a few moments I will. Thanks! Mr. Nelson- thank u for the explanation. as I Had understood the speedo on early NV4500 trucks was driven off of the tail shaft on 2x4s or tcase output shaft. I'll check the rear sensor again and see if I can get a good look through the sensor hole

Ok so I'll try to make it short sweet and to the point as best I can. I recently put my truck back on the road after many years of it waiting its turn to be finished. It's a 97 ram 2500 2wd nv4500 single cab , with 201 xxx on the clock. I installed a big input southbend dual disk, turbo, wheels tires blah blah blah. Well after 111.6 miles of breaking it back in, I noticed my speed and odometer just quit. No ABS light no air bag light like I've a lot of people have pop up under this condition. First thing first I pulled the transmission speedo drive sensor, cleaned it re installed.....nothing Next I pulled the rear diff wheel speed sensor, cleaned it...nothing. Okay.....next I replaced both sensors with new ones, still nada Next I re clocked the speedo drive the tail shaft drive gear, I also thoroughly inspected both gears, no effects that I. Could see in either of them. NOTE, the only thing I noticed, is when you look in the hole of the tailshaft housing where the sensor housing goes in, the tailshaft drive gear was about an 1/8 inch off enter to the left (toward the front bumper) After that I traced some wiring back and fond driver side between the IC and the fender well a bundle of wires had been pinched. I crack the loom open and find BLACK/ LT BLUE tracer chaffed to the copper. I know that's the sAme color as the middle wire on the speed sensor. Patch it up , nothing Ok, grab the snap on test light with built in volt meter , I get 3.9v and 7.1v...from what I've read I should have gotten 5v and 8v Last ditch diag. Effort...I slap the scan gauge in....hers what I notice -I have no MPH input which I would think rules out my cluster being bad -water temp is glued at -40 thermostat cycles fine on the dash gauge -from the dash tachometer vs. the scan gauge, the scan gauge is low by about 200-300 rpm when I'm rowing gears from a light until up to highway speed or back to idle. - with my air on full blast, wipers on high, radio on high beams on, the scan gauge reads 13.2-13.3v MAX. With the loads off it reads 13.5 MAX MY QUESTION IS...could my alternator be my problem? And outside of the aforementioned procedures....anyone's insight IS GREATLY APPRECIATED Because I just want a speedo so I can get my truck inspected