On a 2012 LR4, I get occasional (but very brief!) complete electrical system failures that result in the headlights turning off, engine cutting out, stereo resetting , gauges going dark etc. It's only a fraction of a second when it happens, but sometimes it blinks 2-3 times (still less than a second total). Every time it has happened while driving, it always starts running again and has never left me stranded. If it weren't for the headlights blinking at night making it so obvious, it would hardly noticeable during the daytime. The first few times it happened, it was like hitting a big expansion joint in the road at 70mph.
After such things happen, when I eventually park the truck and hit the start/stop butting, the truck instantly de-powers completely: The engine shuts off normally enough, but all accessories turn off instantly (dome lights, 12v charger plugs, etc). When the start/stop button is pushed again, the truck boots up like you would see after installing a new battery: The mechanical clock spins around to 12am, the digital clock resets to 12, the infotainment system does a cold boot.
It's a strange fault since whatever is happening is like disconnecting the battery and alternator at the same time! I don't know if there is a main relay or a battery management relay that could cause such cutoffs.
Any idea?
I do have a brand new battery that was installed by a reputable land rover specialty mechanic, but the problem did not go away. They have not replaced anything else that I know of in troubleshooting this. I want to replace the negative cable that houses the Battery Management system, but I thought it would be wise to ask you all for any insight before we start throwing parts at this thing. Even with a new/charged battery, you can't run the stereo or dome lights for very long without the engine running before you get the battery discharge messages on the infotainment screen.
The symptoms are very much like a relay that opens/re-closes almost instantly or "chatters", but I know very little about the LR4 electrical system.
Any insight would be appreciated!
I've had timing chains/tensioner/phasers changed on this thing (at great expense!), so I hope to keep her running for a while!
After such things happen, when I eventually park the truck and hit the start/stop butting, the truck instantly de-powers completely: The engine shuts off normally enough, but all accessories turn off instantly (dome lights, 12v charger plugs, etc). When the start/stop button is pushed again, the truck boots up like you would see after installing a new battery: The mechanical clock spins around to 12am, the digital clock resets to 12, the infotainment system does a cold boot.
It's a strange fault since whatever is happening is like disconnecting the battery and alternator at the same time! I don't know if there is a main relay or a battery management relay that could cause such cutoffs.
Any idea?
I do have a brand new battery that was installed by a reputable land rover specialty mechanic, but the problem did not go away. They have not replaced anything else that I know of in troubleshooting this. I want to replace the negative cable that houses the Battery Management system, but I thought it would be wise to ask you all for any insight before we start throwing parts at this thing. Even with a new/charged battery, you can't run the stereo or dome lights for very long without the engine running before you get the battery discharge messages on the infotainment screen.
The symptoms are very much like a relay that opens/re-closes almost instantly or "chatters", but I know very little about the LR4 electrical system.
Any insight would be appreciated!
I've had timing chains/tensioner/phasers changed on this thing (at great expense!), so I hope to keep her running for a while!
