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Discussion Starter · #1 ·
First time post, folks, but reading the forum has been extremely useful in solving past problems. This one has me confused/stumped.

My 08 LR3 seems to have cascading electrical problems:

- radio speakers that work/don't work, often related to slow speed driving or stopping
- park brake fault that comes and goes
- visibly flickering interior lights
- visibly flickering brake and reversing lights
- nav screen that will frequently reboot

and, lately, the seat controls and window controls will be extremely sluggish, as if there isn't enough power to run them. In fact, the windows will not automatically raise on their own, they often behave as if they're encountering resistance and will reverse.

Background: I replaced the alternator (cheap aftermarket from parts shop) and battery (Interstate) this summer. Code 753 display shows between 13.5 and 16 v when driving, depending on speed. Local mechanic also redid brakes just before this all started happening. The air compressor also seems to be dying a slow death - I've had a warning and audible noise for about nine months.

Any help appreciated.

Colin
 

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16V sounds high - should;t be much above 14. Where are you measuring that ?If you are operating this far out of spec it could cause electrical issues. Maybe bad voltage regulator - not sure if that is part of the alternator or separate - but I would fix that issue first before continuing to debug ...

But flickering, intermittent working sounds like loose or bad ground somewhere - which could also be cause of bad voltage reading. I was reading another post the other day about bad ground wire - search for that -

If brakes were done - park brake issue could be something else - if rear rotors were taken off - cable might not be replaced right - or adjustment not done right - I would get that taken care of by LR specialist soon ...



First time post, folks, but reading the forum has been extremely useful in solving past problems. This one has me confused/stumped.

My 08 LR3 seems to have cascading electrical problems:

- radio speakers that work/don't work, often related to slow speed driving or stopping
- park brake fault that comes and goes
- visibly flickering interior lights
- visibly flickering brake and reversing lights
- nav screen that will frequently reboot

and, lately, the seat controls and window controls will be extremely sluggish, as if there isn't enough power to run them. In fact, the windows will not automatically raise on their own, they often behave as if they're encountering resistance and will reverse.

Background: I replaced the alternator (cheap aftermarket from parts shop) and battery (Interstate) this summer. Code 753 display shows between 13.5 and 16 v when driving, depending on speed. Local mechanic also redid brakes just before this all started happening

Any help appreciated.

Colin
 

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First thing I would do is go check your negative battery cable. Remove it completely from the car and examine it to see if you can find any corrosion. If you don't see any visible corrosion, take a multimeter and check the resistance of the cable while you bend it around and flex it a bit. See if it changes or gets really high at any point.
 

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Also see this post from range rover forum - and check ground wire to alternator while you are at it for corrosion
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I have fixed alot of these with that problem. I have found a fair amount of them have a bad ground on the passenger motor mount. Land Rover sometimes didn't drill the hole deep enough and it seems like the bolt is tight but it has just bottomed out in the threads. If that ground is good then depending on the weather you might have water dripping into your CJB(central junction block). Passenger kick panel area. There is a problem with the mouldings on the outside of the A pillars leaking water through the clip holes. There is a updated kit to reseal those mouldings. If you need the part number I can supply it. If that all looks good you probably have a bad ignition switch.
 

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16V is definitely a problem. It would by typical to have a bad cheap replacement alternator. Strange problems indeed. The one time I had abnormally high charging voltage (14.9 to 15) it turned out I had a bad 2nd battery.
 

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Sounds alot like a bad alternator. I would check the connection as stated before just to verify. We are starting to see many of these alternators fail. They can cause all kinds of warnings and lights to appear. Shouldn't be much over 14V for sure!
 

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Sounds alot like a bad alternator. I would check the connection as stated before just to verify. We are starting to see many of these alternators fail. They can cause all kinds of warnings and lights to appear. Shouldn't be much over 14V for sure!
Are you doing the OE new, or remans, and what's your experience. I have been thinking I'd like to replace mine with 136k on it before it fails, but want to get the best one I can get. PM me if you're selling reasonably.
 

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Discussion Starter · #8 ·
Thanks everyone - finally got it back from the dealership, and it was the alternator - as tlt guessed. At rest it was 12.6, charging at 15. New alternator, and everything seems to be working.

Now, to climb underneath and replace the suspension compressor!
 

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That should be reasonable easy. If you can, use the computer system to depressurize the suspension first. I let it out of the air tank valve, and had a heck of a time getting it to seal back up.
 
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