Alternator problems

2013 Renault Clio 1.2 petrol
Car: Renault Clio
Year: 2013
Variant: 1.2 petrol
Categories: Electrics, ECU, Warnings & Lights
My sister got a Clio 1.2 petrol (2013), she took it to a garage because the battery was not charging, there said it was the alternator, there replaced the alternator with a new one and chucked the old one away, there did not take any information off the old alternator, now on the dash its say's battery charging fault, so she took it back to the garage and there replaced it again, she left it for about a year, the battery was getting charge but that warning light kept coming on, now the battery is not charging, she said she does not mind getting / paying for a new battery, but how does she get the warning lights to go off? also if the alternator is the wrong one again how does she get the correct one? she phone the Renault main dealers up and there said with out the correct information for the alternator there are about 18 different one's for that engine and year. any idea's?
Problem added: Apr 13, 2021 (3 years ago)
You need to check the alternator voltage charging rate and if o.k , load test the battery which will show any weak / dud cells . It 's important you get the correct alternator , how you would do so in your case now , I don't know . Especially if it was a replacement / reconditioned as opposed to genuine OEM .There are often variations , including wiring connectors / plugs. even though they may fit the car . On some of the Renault alternators there is an exciter/charge warning wire which puts out the light . Not the first time the wrong alternator has been without this and wiring changed to suit . It was either as part of plug or separate , thin wire .
Answered Apr 13, 2021 (3 years ago)
thank you i will tell my sister
Answered Apr 13, 2021 (3 years ago)
The story so far, had a look at the problem with my sisters car, the voltage on the battery when the engine is switched off is just over 12 volts (12.3 to 12.5 volts) when the engine is turned on and is running (with every thing turned off i.e heaters, wipers, lights and the radio (all the doors are closed)) the voltage goes up to 14.5 volts (or there about) when you turn the heater, lights on (both turned on together with engine running) the voltage drops about 0.5 volts or so. Now then if I can get a feed to the blue cable (exciter cable) to put the light out that should do it? Were the exciter cable plugs on to the alternator is that negative or positive?
Answered Apr 29, 2021 (2 years ago)

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