The distributor cap wire positions will correspond to that firing order, but there's no single universally correct "map" of the cap. The orientation of the distributor cap and rotor within the engine compartment can vary slightly depending on manufacturing tolerances and even the particular distributor itself.
To determine the correct wire placement on *your* distributor cap:
1. Find the #1 cylinder: Locate the #1 spark plug. This is usually the front passenger side (on a typical RWD Ram).
2. Identify the distributor rotor position: With the engine at its number one firing position (all the way to the top of the compression stroke), note the position of the distributor rotor. The rotor will be pointing to the terminal on the distributor cap that corresponds to cylinder #1. You'll likely need a timing light or a reliable method for determining Top Dead Center (TDC) to ensure proper cylinder #1 placement.
3. Follow the firing order: Once you know where #1 is on the cap, follow the firing order (1-8-4-3-6-5-7-2) to connect the remaining wires.
Important Notes:
* Don't guess. Incorrect wire placement can cause serious engine damage.
* Use a service manual: A factory service manual for your specific year and model Dodge Ram will provide diagrams and instructions for proper distributor cap wiring. These manuals are your best resource.
* Professional help: If you're not comfortable working on your ignition system, it's best to seek the help of a qualified mechanic.
While online diagrams might exist, they're not guaranteed to match your particular distributor's orientation. The above method is the only reliable way to determine the correct wiring for your truck's distributor.
