Alternator Failure?

Oex units may possibly use slightly incompatible voltage regulators, I.e. the oem denso alternator is designed specifically for the application. Hence the previous comment about not scrimping on the replacement :-( . Jc

Thanks for the warning re the regulator within the rebuilt units being perhaps different from Denso factory units.


I must say I find the whole question of the regulator to be one of those mystery parts.

About all I could find available was something manufactured by Transpo called an IN6349 and that is for the newer alternators, YLE500390 part number and better.

For the older alternators, part number YLE500190, such as was on my 2005 LR3, the regulator was a Regitar VRH2005-142 that is physically different in shape from the IN6349 regulators and as such, are the end caps on the alternators, (no shiny regulator cooling fins showing on the newer alternators).

I never did find a Denso part number for a Denso regulator however.

Maybe the rebuilders cannot find one either.

The alternator i fitted was new not rebuilt.

Now the car is at the dealers and they say the transmission fault code was due to excessive voltage.

Could the battery cable from the alternator have melted wires close to it when it shorted and drained the battery so fast?

I now must assume the alternator is not built with the right goodies inside of it to regulate the voltage... the castings looking poor should have set off the warning bells.

Time for a kluger i think :-(

The replacement alternator not working could be just bad luck.

When my original alternator failed, I had the local alternator shop install a Wilson WAI rebuilt. It worked fine for a week and then failed. They replaced it for free and also ended up installing a new alternator belt as upon startup and testing, they realized the pulley had the wrong groove count and that destroyed the original belt.

That required removal of the alternator and switching pulleys; two years later, the alternator is still OK. I gather the shop does not intend to install Land Rover logos on their front window.

I have a ScanGauge II monitor connected full time to my OBD port, hence I can watch the system voltage. In my case, both alternator failures were what I regarded as regulator failures rather than generator failures.

I began to note that the Scangauge II was displaying a fixed voltage of about 13 volts, rather than the voltage fluctuating between say 13.5 and 14.9 volts. I regarded the static voltage as some default charge rate built into the system.


We have daytime running lights here and I have the fancy radio with the big amp but power generated was always enough to supply all but charging of the battery seemed to suffer more than usual. My Traxide system tended to mask that as well. What this meant to me was that where there was no routine visual voltage monitoring of the system, one could drive for months thinking all was fine. Watching the voltage readout was how I determined the first replacement alternator was probably defective as well. For the first week voltage readouts were as one would expect - they varied, and then after the first week, they went static again.

In other words, your next alternator may be OK and there is nothing else wrong with your 3 - it was just bad luck.


https://www.aulro.com/afvb/images/im...014/08/747.jpg

So the dealership found the code TCM P0563 System High Voltage and now I definitely suspect the alternator is doing the wrong thing.

Will a Denso replacement suffice? Or do I shell out and pay $1200 for a Genuine land rover unit?

The dealer quoted $1497.35 ... !!!

Ebay has a lot of not real denso units and a few that look legit but who knows.

Where in Australia can we get a good honest product for a good honest price?

Denso is the way to go. You may need to import to get a decent price. This mob here are good
DAN 987 ALTERNATOR 2 7TDV6 BRAND NEW DENSO AS O E YLE500200

Thanks Sheerluck,

I have been quoted RO-YLE500400

Are you sure the 200 is the right one?

Quote:

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Originally Posted by tiojeffe

Thanks Sheerluck,

I have been quoted RO-YLE500400

Are you sure the 200 is the right one?

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400 superseded 200. They've just got the old part number. Drop them an email if you're worried, but ~$400 delivered is better than $1400!

You might find this older thread interesting. It shows how these alternators are just plain a problem. About a dozen posts down on the first page, the post by The Large One, as below, about sums it up.

LR have withdrawn the exch unit from sale because of quality issues
advising only new replacement which surprise surprise is now out of stock https://www.aulro.com/afvb/images/im...014/08/708.jpg

DISCO3.CO.UK - View topic - Denso Alternator shortage - Issue resolved

Even Land Rover acknowledges it is having problems and their solution is only Denso brand new.

And it also shows the aversion to anything that is not Denso as well. Seems Denso is the best solution by a long chalk.