computers

[joey74]

I'm new here so hello. My sons 98 dodge 2500 diesel has some electric problems speedometer dosen't work and other problems like wipers and windows. So advance auto tell him the computer is messed up so he put one in it , same problems. His friends says there is two computers one on firewall other is sopose to be under dash. Is there two computer or not if there is where is it? Thanks Joey!

 

[Merc225hp]

This will help u out lots.

http://www.ramforum.com/f77/2nd_gen_service_manual-986/

 

[DodgeTx]

has the dash been removed any time recently? I had a Problem like this where one of the plugs wasnt seated properly once I pushed it back in power to everything.