* Internally mounted: Most likely, the voltage regulator is *inside* the alternator itself. This is the more common arrangement in vehicles of that era. You won't find a separate voltage regulator component. If this is the case, you'd need to replace the entire alternator if the regulator fails.
* Externally mounted: Less common for this year, but possible. If it's externally mounted, it might be located on the inner fender well near the battery or possibly attached to the alternator itself, but still a separate unit. You would need to consult a wiring diagram for your specific van's engine to be sure.
To determine which is the case for your van, the best approach is to:
1. Check your alternator: Look at the alternator closely. If there are no obvious external wires or connections going to a separate component (besides the power and charging wires), it's almost certainly internally regulated.
2. Consult a wiring diagram: A wiring diagram specific to your 1986 Dodge Ram van's engine will show the exact location of the voltage regulator if it's externally mounted. You can often find these diagrams online (through sites like Haynes or Chilton manuals) by searching for your specific engine model (e.g., "1986 Dodge Ram van 318 wiring diagram").
In short, start by examining your alternator; it's highly probable the regulator is inside. If unsure, use a wiring diagram for definitive location information.
