Hi everyone—this is my first post, and I really appreciate the input and perspective from other Ram owners.
I’ve been chasing an electrical issue, mainly with exterior lighting (headlights / brake lights / tail lights). I’ve searched online but haven’t found a clear answer for my situation.
What happened
I did a window tint strip on the windshield, and immediately afterward my horn started blaring and the lights were flashing (basically a full electrical freak-out).
What I tried
• Disconnected the battery and left it overnight
• Reconnected the cables the next day
• The truck started normally and the check engine light went off
What’s still wrong
I still have lighting problems—specifically:
• Right rear tail light is out
• Brake lights are out
• Some exterior lights work, but a few don’t
What I’m trying to figure out
Since some lights work and most other systems seem fine, does this point more toward:
• A bad BCM that needs replacement, or
• A ground / low-voltage issue, or
• A fuse / wiring problem?
I’m not very mechanically inclined, but I went ahead and bought a Security Gateway bypass cable. My plan is to test each module and see if anything throws a BCM-related code before I take it to the dealership and potentially spend thousands on a BCM replacement.
I also found a company in Atlanta called UpFix that says they can repair BCMs for my Ram, but I’m worried they’ll get it and tell me there’s nothing wrong with it.
My current plan is to wait for the bypass cable to arrive Friday, run scans/tests, and go from there—but I wanted to ask the group:
Can a BCM that’s had water intrusion actually be repaired, or is it usually a replacement situation?
I’ve been chasing an electrical issue, mainly with exterior lighting (headlights / brake lights / tail lights). I’ve searched online but haven’t found a clear answer for my situation.
What happened
I did a window tint strip on the windshield, and immediately afterward my horn started blaring and the lights were flashing (basically a full electrical freak-out).
What I tried
• Disconnected the battery and left it overnight
• Reconnected the cables the next day
• The truck started normally and the check engine light went off
What’s still wrong
I still have lighting problems—specifically:
• Right rear tail light is out
• Brake lights are out
• Some exterior lights work, but a few don’t
What I’m trying to figure out
Since some lights work and most other systems seem fine, does this point more toward:
• A bad BCM that needs replacement, or
• A ground / low-voltage issue, or
• A fuse / wiring problem?
I’m not very mechanically inclined, but I went ahead and bought a Security Gateway bypass cable. My plan is to test each module and see if anything throws a BCM-related code before I take it to the dealership and potentially spend thousands on a BCM replacement.
I also found a company in Atlanta called UpFix that says they can repair BCMs for my Ram, but I’m worried they’ll get it and tell me there’s nothing wrong with it.
My current plan is to wait for the bypass cable to arrive Friday, run scans/tests, and go from there—but I wanted to ask the group:
Can a BCM that’s had water intrusion actually be repaired, or is it usually a replacement situation?
