alternator failures - Land Rover Forums : Land Rover and Range Rover Forum
 
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post #1 of 5 (permalink) Old 05-15-2019, 06:04 PM Thread Starter
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alternator failures

my 2006 sport is eating alternators at a rate of 1 per month. the shop decided it was caused by a faulty ECU. ECU replaced and reprogrammed. 2 days and 71 miles, yep dead. so the body count is 5 alternators, two batteries and one ECU.

need a solution.

please!!!
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post #2 of 5 (permalink) Old 05-16-2019, 03:18 AM
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How's the voltage output of it when it works, did somebody measure that? ...cos if the main output lead is chaffed somewhere and leaks to earth that woud certainly kill it

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post #3 of 5 (permalink) Old 05-16-2019, 08:51 AM Thread Starter
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wiring was checked, and it fine. when working it's charging correctly but some times the ecu is telling the alternator to overcharge at upto 22 volts. this kills the battery and alternator. is there anything between the ecu and alternator?
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post #4 of 5 (permalink) Old 05-16-2019, 10:45 AM
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Quote:
Originally Posted by cmrwash View Post
wiring was checked, and it fine. when working it's charging correctly but some times the ecu is telling the alternator to overcharge at upto 22 volts. this kills the battery and alternator. is there anything between the ecu and alternator?
The ECU is hardwired to the generator and i doubt that it's tellig it to charge to 22

The voltage on the battery must be checked at that point cos it seems that the batt sensing system in the alternator considers that there's not enough charging or something like that... can be a bad contact in the battery junction box, i suspect that the problem is somewhere in that blue circle so measurements are needed to see if the voltage which enters into the junction box is the same with which comes out of it and goes to "BATT SENSE" port ... this thing needs serious troubleshooting so find a skilled auto electrician who understands what's going on.
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My friends call me Fery

2000 Discovery Td5 ES manual

Hawkeye v.6, Nanocom EVO,
VDM UCANDAS, oscilloscope


if you think my english is peculiar it means you didnt hear my japanese

ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.
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post #5 of 5 (permalink) Old 05-17-2019, 08:26 AM
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Originally Posted by sierrafery View Post
The ECU is hardwired to the generator and i doubt that it's tellig it to charge to 22

The voltage on the battery must be checked at that point cos it seems that the batt sensing system in the alternator considers that there's not enough charging or something like that... can be a bad contact in the battery junction box, i suspect that the problem is somewhere in that blue circle so measurements are needed to see if the voltage which enters into the junction box is the same with which comes out of it and goes to "BATT SENSE" port ... this thing needs serious troubleshooting so find a skilled auto electrician who understands what's going on.
X2 on this advice. You need to get someone who knows what they are doing to determine what is happening here. There is definitely some kind of wiring/grounding problem, alternators are pretty robust and do not self destruct easily.
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