1992 Dodge Dakota Battery dies while driving

Make sure the battery has a full charge. Use a digital multimeter across the battery posts, engine and everything off. A fully charged battery should read over 12 volts. Next, start the vehicle, take second reading across battery posts, engine running, the second reading should be higher than the first if the charging system is working.

Also check for voltage at the alternator bat terminal, everything off, it should read battery voltage at that terminal. You may need to check fusible link? Could be a problem with wiring circuit to or from the alternator, if the charging system isn't working.

It sounds like your charging system isn't working. The bat terminal at the alternator should show around 13--14 volts, engine running.

Check the fusible link, if it isn't charging.

My info says the fusible link for the charging system is on the left shock tower, dark green.

Check for charging system trouble codes. To check for mil codes, turn the key just till the dashlites come on, no further. Cycle the key on--off, on--off, on, then the mil on the dash starts flashing, you count the flashes to get the codes. Your looking for two digit codes.

Code 12 means battery voltage to the computer has been lost at some point. Code 41 has to do with your charging system. Code 23 is intake air temp, I believe. Code 55 is end of message/codes.

Four wires at the generator, two are for generator field, Dark blue wire is close to battery voltage, engine running. Dark green wire is switching ground for the generator field, controlled by the pcm. Solid black wire should be generator bat. Terminal. Black wire with white tracer is a constant ground for the generator.