Engine/Transmission (1994 - 1998) Guages won't work and odometer flashes

[NScott]

My 98 12V had been resting for about 3 weeks when I went to start it the other day but the batteries were dead. (They were very old) I replaced the batteries and it started right up but I have NO guages working, NONE, and

no tach either. After you start it the warning lights behind the speedo light up briefly but then go out I guess as they are supposed to, however the airbag light comes back on and the chime starts.

Also the digital odometer keeps flashing the miles up about every two seconds or so.

I dont believe the alternator is putting out OR the current is not getting through to the batteries because the interior light will not brighten after starting the truck or. A friend was following me and said the brake lights were not working either!

Will someone with experience with these symptoms tell me what my problem is? All ideas apprieciated!

 

[Missouri Mule]

I would check alternator output ( take it to an auto parts store or auto electric shop).



I would check to see if the engine speed sensor (by the vibration damper) is getting power and sending signals back to PCM. The engine speed sensor activates the Automatic Shut Down relay which supplies line votage readings to the EVR (located in the PCM).

You mite want to check and see if the ASD relay is working.

The other input to the EVR (which determines alternator output) is the Battery Temp sensor loctated under the driver's side battery tray.