Chrysler RAM50/D50/Arrow 1979-1993 Repair Guide

Alternator Precautions


To prevent damage to the alternator and regulator, the following precautionary measures must be taken when working with the electrical system.

Never reverse the battery connections. Always check the battery polarity visually. This is to be done before any connections are made to ensure that all of the connections correspond to the battery ground polarity of the truck.
Booster batteries must be connected properly. Make sure the positive cable of the booster battery is connected to the positive terminal of the battery which is getting the boost.
Disconnect the battery cables before using a fast charger; the charger has a tendency to force current through the diodes in the opposite direction for which they were designed.
Never use a fast charger as a booster for starting the truck.
Never disconnect the voltage regulator while the engine is running, unless as noted for testing purposes.
Do not ground the alternator output terminal.
Do not operate the alternator on an open circuit with the field energized. Make sure that all connections within the circuit are clean and tight.
Do not attempt to polarize the alternator.
Disconnect the battery cables and remove the alternator before using an electric arc welder on the truck.
Protect the alternator from excessive moisture. If the engine is to be steam cleaned, cover or remove the alternator.
Disconnect the battery terminals when performing any service on the electrical system. This will eliminate the possibility of accidental reversal of polarity.
Do not use test lamps of more than 12 volts for checking diode continuity.