On a 1998 Dodge Ram, the ignition module isn't a separate, easily identifiable component like it is on some older vehicles. The ignition control is integrated into the
Powertrain Control Module (PCM). The PCM is usually located under the dashboard, but the exact location can vary slightly depending on the body style (regular cab, extended cab, etc.) and engine size. You'll likely find it somewhere within the area of the instrument panel, often near the firewall.
It's not recommended to try and find and work on the PCM yourself unless you have significant automotive electrical experience. The PCM is a complex computer controlling many vehicle functions, and accidental damage can be costly to repair. If you're having ignition problems, it's best to take your truck to a qualified mechanic for diagnosis and repair.
