dead short!
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dead short!
I guess I'm off to the dealership tomorrow! Check it out...
My truck has been starting hard for awhile, and occasionally the battery would drain quite quickly before it would start. I went to work yesterday and when I tried to start it, it turned over for a few then started that low battery clicking. Out came the battery charger. I hooked that up and the needle on the charge went ballistic! From pegged to zero and back and forth quickly till the breaker popped! It was almost like I had the terminals reversed. I reset the breaker and the tried reversing the terminals and I got nothing. I turn the key on and everything in the truck cycles on and off quickly and continuously. I'm thinking DEAD SHORT. Someone suggested the GPCM could have been going bad and finally shorted out. I hate to go to the dealership! If you think you could help... Nick
2005 Diesel Excursion
My truck has been starting hard for awhile, and occasionally the battery would drain quite quickly before it would start. I went to work yesterday and when I tried to start it, it turned over for a few then started that low battery clicking. Out came the battery charger. I hooked that up and the needle on the charge went ballistic! From pegged to zero and back and forth quickly till the breaker popped! It was almost like I had the terminals reversed. I reset the breaker and the tried reversing the terminals and I got nothing. I turn the key on and everything in the truck cycles on and off quickly and continuously. I'm thinking DEAD SHORT. Someone suggested the GPCM could have been going bad and finally shorted out. I hate to go to the dealership! If you think you could help... Nick
2005 Diesel Excursion
Hotshot
Joined: Jan 2010
Posts: 10,060
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From: Bristol, TN.
I guess I'm off to the dealership tomorrow! Check it out...
My truck has been starting hard for awhile, and occasionally the battery would drain quite quickly before it would start. I went to work yesterday and when I tried to start it, it turned over for a few then started that low battery clicking. Out came the battery charger. I hooked that up and the needle on the charge went ballistic! From pegged to zero and back and forth quickly till the breaker popped! It was almost like I had the terminals reversed. I reset the breaker and the tried reversing the terminals and I got nothing. I turn the key on and everything in the truck cycles on and off quickly and continuously. I'm thinking DEAD SHORT. Someone suggested the GPCM could have been going bad and finally shorted out. I hate to go to the dealership! If you think you could help... Nick
2005 Diesel Excursion
My truck has been starting hard for awhile, and occasionally the battery would drain quite quickly before it would start. I went to work yesterday and when I tried to start it, it turned over for a few then started that low battery clicking. Out came the battery charger. I hooked that up and the needle on the charge went ballistic! From pegged to zero and back and forth quickly till the breaker popped! It was almost like I had the terminals reversed. I reset the breaker and the tried reversing the terminals and I got nothing. I turn the key on and everything in the truck cycles on and off quickly and continuously. I'm thinking DEAD SHORT. Someone suggested the GPCM could have been going bad and finally shorted out. I hate to go to the dealership! If you think you could help... Nick
2005 Diesel Excursion
Steve
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Joined: Jan 2010
Posts: 10,060
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From: Bristol, TN.
Here is where I am going with this. As near as I can tell, you did not verify battery voltage was low with a meter, before hooking on the charger. What if the pulse was charger induced? I would think in terms of first establishing battery voltage without the charger in place. Then with the batteries isolated from the truck, it would be helpful to hook up the charger to the batteries and take a voltage reading to see what the charger is actually putting out. That way you isolate the batteries from the truck.
If you have an available vehicle, you could also try a set of jumper cables with the batteries hooked up in your truck. Any time you use a charger, you introduce the possibility of "dirty DC current" and AC ripple of varying degrees in your DC output. Once you know the actual state of charge of your batteries and have a viable DC power source, you can check further for a short.
Steve
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So, I unhooked the cables and the battery appeared to be fine. I had it towed to the dealer and they got it running. Not sure yet what they did. They said it threw a bunch of codes (go figure!) and that it was running rough. They told me I need a new FICM, and for $1055 they would put it in! Are you kidding me? It certainly wasn't running bad before all of this! Anyhow, I'll find out more tomorrow morning when I go pick it up.
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