Here's why and what to check:
* Inline Fuse/Circuit Breaker: Look for an inline fuse or circuit breaker in the wiring harness leading to the accessory outlet. This is a common cause of failure and is often tucked away and hard to see. Trace the wiring from the outlet back towards the battery or other potential power sources.
* Wiring Harness Damage: Inspect the wiring harness leading to the outlet for any signs of damage, such as cuts, chafing, or corrosion. A break in the wire will interrupt power.
* Ignition Switch Circuit: Some accessory outlets are switched, meaning they only receive power when the ignition is on. Make sure your ignition is in the "on" or "accessory" position and test.
* Relay: A relay might be part of the circuit. If a relay is faulty, it won't allow power to flow to the outlet. These are usually located in the fuse box or under the dash, but the wiring diagram is needed to confirm its location.
How to find the source:
1. Consult a Wiring Diagram: A wiring diagram specific to your 1998 Dodge Ram Van is essential. It will show you the exact path of the power to the outlet, including any inline fuses, relays, or other components. You can usually find these diagrams online (through forums dedicated to your vehicle) or in a repair manual.
2. Trace the Wires: Carefully follow the wires from the accessory outlet. Use a multimeter to test for voltage at various points along the wire, starting at the outlet and moving toward potential power sources.
If you're not comfortable working with automotive electrical systems, take your van to a qualified mechanic or auto electrician. Improper electrical work can be dangerous.
