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Electrical 3rd Gen Dodge Ram Electrical Problems and Questions.


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  #11  
Old 11-05-2012, 12:28 AM
Tom C. Tom C. is offline
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Question Not The FCM

I've installed a brand new Mopar FCM, purchased from a dealer. Cost was $218.

Easily installed, drove for 26 miles in local traffic, then BINGO, the lights came on the dashboard.

However, I noticed that the dash lights (ABS + Brake) came on when braking for a red light. At this time the head lights automatically came on, turn signals wouldn't work outside, horn wouldn't work, no brake lights, etc.

What would be the next suggestion? Anything would be helpful.
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  #12  
Old 11-06-2012, 10:05 AM
1970m0par440 1970m0par440 is offline
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Default

Hello Tom C. My ABS and Break lights are doing the same thing. I am not sure if any of my other lights or horn is having the same problem but I will check. Please keep me posted if you find a solution.

I recently hit a deer and had to have some body work done. I am not sure if that has anything to do with it or if something could have gotten messed up during the body work. It was only damage to the driver door and front fender and side mirror so I wouldn't think that it would have done anything to the electrical. It has recently become cold too...not sure if the cold weather may have something to do with this?

If I come up with anything I will be sure to let you know!
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  #13  
Old 11-06-2012, 10:53 AM
Tom C. Tom C. is offline
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Default Other symptoms?

1970m0par440, it is important that you post any other symptoms you're having. Please check if your external turn signals work, horn, brake lights, exterior flashers, wipers, high-beam head lights, etc. All the above fail when my Brake+ABS dash lights appear. Sometimes the Low Washer Fluid light will come on and then disappear after a few minutes.

The temperature outside doesn't have anything to do with it. My problem started in the summer when it was warm. Now that its cold, I still have the problem.

I read in a forum that this was happening to a guy and he found that there was a short in one of his censor wires. That is what I'll be looking for next.

The biggest obstacle is that it's an intermittent problem. It doesn't happen when I'm parked/stationary, but only when moving.

Please reply and post all your truck's symptoms.

Last edited by Tom C.; 11-06-2012 at 10:57 AM.
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  #14  
Old 11-11-2012, 04:38 PM
Tom C. Tom C. is offline
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Default Possible solution

Okay, just an update here.

Since replacing the FCM, and still having the same problem, the Mopar dealer agreed to allow a return of the item (new FCM) for a refund. Thank God, $220 bucks refunded.

I've been racking my brains on how to further diagnose this problem. By trade I'm a computer repair technician and one method I use when diagnosing a computer hardware problem is by process of elimination: strip the entire computer down to bare minimum parts and begin to rebuild it. So I've applied this same technique to my truck.

I've pulled every non-essential fuse and relay from my fuse box under the hood. I mean EVERYTHING that I don't need for the truck to run, I removed. Total of 14 fuses and 3 relays removed. Fuses that I pulled include electric brake, trailer lights, trailer battery, power seat, heated mirror, etc.

I just ran the truck 43 miles in local traffic with lots of stop and go. And guess what? The problem is gone!

I didn't touch the fuse for the instrument cluster. It's still there. My dash lights are working because when making a left turn an occasional LAMP OUT light will come (indicates I have a turn signal bulb getting ready to go out).

So, that's it. If the problem returns, it'll be time to call in an exorcist. By the way, do we have of those here on RamForumz? LOL

Last edited by Tom C.; 11-11-2012 at 04:41 PM. Reason: punctuation
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  #15  
Old 11-15-2012, 01:36 PM
Tom C. Tom C. is offline
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Default Not Resolved

Last night when driving exactly at the 50 mile point since resetting my truck's computer, the ABS+Brake Light+Low Washer Fluid lights came on.

The problem still exists.

What's unique though was this has now happened twice at exactly the 50 mile point since resetting the computer. I reset my trip odometer after resetting the computer each time.

QUESTION: is there some sort of sensor tests the computer does every 50 miles or so? If so, what sensors are tested by the computer?
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  #16  
Old 01-09-2013, 02:29 PM
Tom C. Tom C. is offline
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Default Problem Resolved.

I finally resolved the issue...

I've replaced the FCM ... problem still exist.
I've replaced the PDC ... problem still exist, but located the problem from there.

After installing a new PDC (fuse box) and the truck continued doing the same thing so I put the old one back in, however when I slammed the hood closed my wipers came on twice automatically. This got me thinking that because the problem is intermittent and it happened when I slammed the hood closed, there's probably a short somewhere.

Low and behold: The bolt that holds a ground wire coming off the battery and connecting to another group of wires that gets bolted to the fender was very loose. I tightened the bolt, started the truck and while it was running loosed that same bolt again. BINGO. That was the problem.

Apparently that bolt connects to a series of ground wires that runs to all the components that was acting crazy.

I hope this helps someone else.
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  #17  
Old 01-14-2013, 09:49 PM
buzzvoodoo buzzvoodoo is offline
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Default

WOW. that is nuts. I was going to guess that it was the battery due to you having such low Cold cranking amps.
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