2003 r50 alternator

1299 Views 5 Replies 3 Participants Last post by AsdaJnr, Mar 8, 2021

JordR502003Coops

Discussion Starter · Mar 5, 2021

So a new alternator has been installed and it was working great 14.2V-14.5V for a fair few hours. Then when backing into a space thinking the whole headache was done it failed again. This is now x3 alternators in the last 2 weeks including the original. What can cause this. Help please before the girl ends up in the scrap yard!!!!

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AsdaJnr

· #2 · Mar 5, 2021

So assuming this is a fresh post following on from Here

Are you getting the alternator from the same supplier....If so do they have a batch of faulty regulators?

Or is there something demanding excess current from the battery?

Did you fully charge your battery prior to refitting the replacement alternator? If the alternator has to supply all the electrics and a flat battery that would give an excess current draw scenario.

Did you connect up the alternator with battery disconnected?. ie no sparking terminals inadvertently causing an electrical spike through the regulator.

Have you checked for excessive current draw at the battery with ignition off? Multimeter measuring amps between disconnected positive terminal and battery positive cable. Your looking for over a couple of amps possibly double figures.

Have you definitely got the wires to the alternator in the correct order?

Is there a wire that's chafed to earth and is taking all the current to ground?

I know that's many many questions but we're at a disadvantage not being with the vehicle.

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JordR502003Coops

Discussion Starter · #3 · Mar 5, 2021

AsdaJnr said:
So assuming this is a fresh post following on from Here

Are you getting the alternator from the same supplier....If so do they have a batch of faulty regulators?

Or is there something demanding excess current from the battery?

Did you fully charge your battery prior to refitting the replacement alternator? If the alternator has to supply all the electrics and a flat battery that would give an excess current draw scenario.

Did you connect up the alternator with battery disconnected?. ie no sparking terminals inadvertently causing an electrical spike through the regulator.

Have you checked for excessive current draw at the battery with ignition off? Multimeter measuring amps between disconnected positive terminal and battery positive cable. Your looking for over a couple of amps possibly double figures.

Have you definitely got the wires to the alternator in the correct order?

Is there a wire that's chafed to earth and is taking all the current to ground?

I know that's many many questions but we're at a disadvantage not being with the vehicle.

Hi AsdaJnr,

New to this forum stuff so yes I should of carried on the original thread.

So I installed another alternator from a different supplier. It worked for a few hours yesterday evening and then this morning I arrived to work and it stopped again.

I haven't managed to check amp's yet but will do once I have finished work.

Battery is brand new and was fully charged. I just can't see how it works for a short time and then they just give up. It's very very frustrating!!

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AsdaJnr

· #4 · Mar 5, 2021 (Edited)

what amperage was the original alternator and what is the replacement ?I

Do you have any part numbers from the original and new units so we can check compatibility.

Do you still have the old alternator? If so have you had that alternator remotely bench tested or any of the replacements come to that and know each one has been faulty and that it is not a wiring fault?

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mike1967

· #5 · Mar 5, 2021

prob find the power steering pump controller has failed and demanding more amps than can be produced this will pull the regulator down fast and over heat the windings in the alternator, as its gen 1 car its most likely the problem nasty rubbish pumps

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AsdaJnr

· #6 · Mar 8, 2021

...are you any further on with this Jord502003Coops?

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