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1995 dodge 3500 tach and charging problems no overdrive

  
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1995 dodge 3500 tach and charging problems no overdrive

 
peterbilt359 peterbilt359
New User | Posts: 28 | Joined: 03/09
Posted: 03/16/09
06:22 PM

my dodge pickup when first starting up for the day shows 14 volts charging the over drive does not work but goes into lockup. some times the tach will just drop and will not read shortly after thet the amp gauge will drop this whole time there is no overdrive  

stroker_smoker07 stroker_smoker07
New User | Posts: 9 | Joined: 02/09
Posted: 03/16/09
09:06 PM

does your check engine light act like it shorts out when your tach falls if so my '95 dodge dually is doing the exact same thing and i have been looking for answers since january and i have had no luck but i am glad to know its not just mine
good luck man  

peterbilt359 peterbilt359
New User | Posts: 28 | Joined: 03/09
Posted: 03/17/09
05:07 PM

yep i was watching it to night when i came home and the voltage seemed to drop down to 12 volts like u said the check engine light seems to short out will yours reset its self whenn you turnn it off then turn it back onmine does not but if i let it sit over night it works just fine the next morning then it does it when i go home after work  

rustySS rustySS
New User | Posts: 34 | Joined: 02/09
Posted: 03/17/09
05:29 PM

I believe the alternators on older 12 valves have an external regulator. i can't remeber where it is located, but follow the large charge wire, and it will lead you to a junction block containing the regulator. Get it checked out.

I know this might seem silly, but the tach on Gen 1 12 valves runs off the alternator, but I'm not sure if the newer 12 valves do too.

Other things you can check is the firewall block (where the wires run into the cab). A 1/4" bolt holds the two halfs together, so try snugging it up. This would explain no OD. There is also a crank positioning sensor located behind the balancer on the gear case cover. I have heard of people have these go bad too.

Thats all I can suggest

Rusty


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peterbilt359 peterbilt359
New User | Posts: 28 | Joined: 03/09
Posted: 03/17/09
06:09 PM

hold on wat does this 1/4 bolt do u lost me  

rustySS rustySS
New User | Posts: 34 | Joined: 02/09
Posted: 03/17/09
08:37 PM

Ok, every wire that runs from the cab out to the rest of the truck is contained in a plastic 2 piece firewall conduit (3"x3" square black plastic). One piece is inside the cab and has a large harness of wires running to it, same on the outside below the brake booster. They are sandwiched together and held with a 1/4" or similar screw in the center or 4 screws on each corner, (I can't remember which style the 1995 uses). Anyway, find the hardware that holds these two conduits together and "snug" them up. Don't overtighten!!!


Rusty


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peterbilt359 peterbilt359
New User | Posts: 28 | Joined: 03/09
Posted: 03/18/09
03:13 PM

is this bolt or screw on the inside of the cab or the outside on the engine compartment fire wall  

rustySS rustySS
New User | Posts: 34 | Joined: 02/09
Posted: 03/18/09
04:47 PM

On the engine compartment firewall. At the factory, the seal the area with tar adhesive, so you might have to "dig" carefully to access it.


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peterbilt359 peterbilt359
New User | Posts: 28 | Joined: 03/09
Posted: 03/19/09
06:37 PM

k tach and charging fixed still no overdrive  

red_96 red_96
User | Posts: 226 | Joined: 10/07
Posted: 03/19/09
07:01 PM

On the 96 dodge ram diesel the charging is controled by the ECM. inside the ECM
is the sense module, it knows your daily driving and tells the generator to charge batteries. if it is not charging check ASD relay in black box in engine compartment.
it is cheap i would go with a new replacement. in cold climates the overdrive will not work until engine and trans warm up, this is also controlled by the ECM.
Tachometer is controlled by crank position sensor.
There is also a relay for trans next to ASD relay in black box, again they are cheap
replace it.

94 95 96 Dodge Rams are the same, they changed in 97 on.  

peterbilt359 peterbilt359
New User | Posts: 28 | Joined: 03/09
Posted: 03/20/09
08:40 AM

my box must be diffrent i dont have a asd relay  

peterbilt359 peterbilt359
New User | Posts: 28 | Joined: 03/09
Posted: 03/20/09
04:13 PM

is there any way to check the overdrive electrical wiring and the over drive it's self it goes into lock up but does not drop the next drop on the tach like it doesnt act like it drops 5 times just four Mad  

rustySS rustySS
New User | Posts: 34 | Joined: 02/09
Posted: 03/20/09
10:10 PM

????????? Punctuate, so people can read what you are typing without having to read the really long sentance 18 times to figure out what you are trying to say when it should only be read once it is very annoying thank you   Mad



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peterbilt359 peterbilt359
New User | Posts: 28 | Joined: 03/09
Posted: 03/21/09
07:11 AM

Sorry used to texting to much. Blush  Ok i was wondering is there any way to check the overdrive wiring harness. Is there any way to check the transmission part of the overdrive system basically how can i check the overdrive system  

tbake1178 tbake1178
New User | Posts: 1 | Joined: 11/14
Posted: 11/16/14
08:43 AM

I'm having problems with my charging on my 95 Dodge diesel. I was told there is a voltage regulator (built-in) in the ecm on the firewall behind the air box. I took the ecm off a deferent truck did not change anything. where do I look now?