08 LS460 Won't start acts like battery is dead
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Driver School Candidate
Joined: Nov 2014
Posts: 5
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From: Georgia
08 LS460 Won't start acts like battery is dead
I have a 08 ls460 I replaced the ml amp in yesterday, the radio worked for about 10 mins then went silent again. I checked the 30amp fuse under passenger dash and it was blown so I replaced it with another 30amp fuse as soon as it plugged in it blew. I then put a 50 amp fuse in "that's all I had" it didnt blow but said battery was low then everything went dead. I checked my battery and it's good, nothing works on dash it won't start or light up but my seats work and driver rear window rolls up and down but that's it.
Pole Position
Joined: Jun 2018
Posts: 2,422
Likes: 220
From: Ontario
I have a 08 ls460 I replaced the ml amp in yesterday, the radio worked for about 10 mins then went silent again. I checked the 30amp fuse under passenger dash and it was blown so I replaced it with another 30amp fuse as soon as it plugged in it blew. I then put a 50 amp fuse in "that's all I had" it didnt blow but said battery was low then everything went dead. I checked my battery and it's good, nothing works on dash it won't start or light up but my seats work and driver rear window rolls up and down but that's it.
I assume you did the basics and disconnected the battery etc and reconnected? If the fuse blew once that should have already told you there’s a problem. 2nd time should have made you stop right there but then you gave it a bigger fuse so whatever was causing the problem could send the rouge voltage to the rest of the system ?so who knows what else you blew in the process? You do know what a fuse is for right? That’s your first warning and line of defence...
6th Gear
Joined: May 2026
Posts: 6
Likes: 3
From: CA
I have a 08 ls460 I replaced the ml amp in yesterday, the radio worked for about 10 mins then went silent again. I checked the 30amp fuse under passenger dash and it was blown so I replaced it with another 30amp fuse as soon as it plugged in it blew. I then put a 50 amp fuse in "that's all I had" it didnt blow but said battery was low then everything went dead. I checked my battery and it's good, nothing works on dash it won't start or light up but my seats work and driver rear window rolls up and down but that's it.
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Intermediate
Joined: Nov 2019
Posts: 281
Likes: 61
From: QLD
I have a 08 ls460 I replaced the ml amp in yesterday, the radio worked for about 10 mins then went silent again. I checked the 30amp fuse under passenger dash and it was blown so I replaced it with another 30amp fuse as soon as it plugged in it blew. I then put a 50 amp fuse in "that's all I had" it didnt blow but said battery was low then everything went dead. I checked my battery and it's good, nothing works on dash it won't start or light up but my seats work and driver rear window rolls up and down but that's it.
You replaced the amp. The new one is blowing your fuse. The amp seems to be your problem.
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