Anything is possible of course, but the only time I have seen that fuse array blow is when the vehicle is improperly jumpstarted or one of the battery positive terminals was shorted to ground
why would 150 amp fuse block blow?
I have a 2022 Grand Cherokee (WK) with 5k miles. The other day at a stop light, all hell broke lose. Auto stop/start would not start, dash alarms came on, battery light lit up. Finally got it started but then got a screen that basically said car is about to die, stop somewhere safe. Was able to pull into a parking lot and the car just jerked and died. Waiting for a tow, everything else electrical eventually died as well.
Searching the forum I found a reference to a "rogue" alternator. That was my suspicion as well, but dealership says all is well and batteries are fine, just the blown fuse block which of course they want me to pay for since fuses are not under warranty. But in my experience, fuses just don't blow, especially in fairly new cars. I also suspect that the batteries are fried after giving their all to run the car until it died.
Is the dealership just incompetent or could a 150 amp fuse block just go?
Searching the forum I found a reference to a "rogue" alternator. That was my suspicion as well, but dealership says all is well and batteries are fine, just the blown fuse block which of course they want me to pay for since fuses are not under warranty. But in my experience, fuses just don't blow, especially in fairly new cars. I also suspect that the batteries are fried after giving their all to run the car until it died.
Is the dealership just incompetent or could a 150 amp fuse block just go?
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Did the dealership thoroughly check the battery compartment?
Perhaps something was in there that could have caused a short?
Perhaps something was in there that could have caused a short?
rats eating wiring
Neither are likely unless something shorted while driving. I suspect it has something to do with the auto stop/start since that's when it occurredAnything is possible of course, but the only time I have seen that fuse array blow is when the vehicle is improperly jumpstarted or one of the battery positive terminals was shorted to ground
Don't know what they did. Not impressed with them so far.Did the dealership thoroughly check the battery compartment?
Perhaps something was in there that could have caused a short?
If there was a short or wire adrift under there, you should see some damage to the battery hookup and, perhaps the spot where it grounded. Did you see the batteries and associated wiring?
Both batteries are under the front seats, so if they shorted I would have heard and there would have been some smoke I would assume. So I doubt they shorted at the batteries.
Thats an interesting theory........Searching the forum I found a reference to a "rogue" alternator.....
Just some wild 'what if's' brain storming.
If the alternator's field intermittently shorted internally, complete shorted diode bridge or the field control wire from the PCM shorted, the alternator could of went full voltage balls with no voltage regulation.
No telling for sure what would happen but i'd think the batteries would probably be toast and the fuse too.
This doesn't sound like anything you did since it happened while stopped at a light where the small ASS battery comes into play to power the electrical system while stopped.
Did the dealership at least take a look at the batteries for any traces of a short to ground?
Sometimes a short circuit to ground can fix itself by blowing open the short contact area but that would definitely leave tell tale clues especially considering the large amperage fuse blowing.
If the dealership found no root cause for the fuse blowing might want to be prepared for it to possibly happen again.
So far no further word from them after I refused to pick it up when they just replaced the block. Reached out to service manager to see if he can light a fire, but I still suspect the alternator failed. And yes, I think the batteries are toast but they checked and said they were good. I have doubts. They also wanted me to pay for the fuse replace and I refused that as well since if a mechanical or other under warranty item failed, then that should be covered as well.Thats an interesting theory.
Just some wild 'what if's' brain storming.
If the alternator's field intermittently shorted internally, complete shorted diode bridge or the field control wire from the PCM shorted, the alternator could of went full voltage balls with no voltage regulation.
No telling for sure what would happen but i'd think the batteries would probably be toast and the fuse too.
This doesn't sound like anything you did since it happened while stopped at a light where the small ASS battery comes into play to power the electrical system while stopped.
Did the dealership at least take a look at the batteries for any traces of a short to ground?
Sometimes a short circuit to ground can fix itself by blowing open the short contact area but that would definitely leave tell tale clues especially considering the large amperage fuse blowing.
If the dealership found no root cause for the fuse blowing might want to be prepared for it to possibly happen again.
Tell the service manager since they found no root cause you have zero confidence that it won't happen again.So far no further word from them after I refused to pick it up when they just replaced the block. Reached out to service manager to see if he can light a fire, but I still suspect the alternator failed. And yes, I think the batteries are toast but they checked and said they were good. I have doubts. They also wanted me to pay for the fuse replace and I refused that as well since if a mechanical or other under warranty item failed, then that should be covered as well.
One thing you can suggest if you have a backup vehicle or can get a loaner is to ask the service manager either himself or one of the dealership employees to drive it around for a week or so.
Worth a try.
5K miles? Did it sit on the lot for a while, and could it have been scavenged for a part, like a fuse? I recall some car parts in short because of supply chain problems.I have a 2022 Grand Cherokee (WK) with 5k miles...
Is the dealership just incompetent or could a 150 amp fuse block just go?
But, the warranty does seem to say a fuse is not covered.
• replacing filters, coolant, spark plugs, bulbs, or fuses (unless those costs result from a covered repair)
Honestly, I cannot recall the last time I had to replace a car fuse. But, a month after my new Trane AC unit was installed in 2017. It quit because of a blown fuse. So, a fuse made by a good company, can just blow. In my experience.
I am pleased to say my fuse was not specifically excluded by the Trane warranty. And, I'm glad for your sake it was a relatively inexpensive item.
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