Help I tried Replacing My Alternator

[ZayanMA]

Hello everyone,

I tried to replace my alternator on my 2005 Jazz. I bought a second hand one from eBay which had 16000 miles on it.

After a while day I managed to finish everything up but when I put the key in the second position (to turn the electrics on) I hear some weird high pitched electrical noise from I think near the battery? And then a click noise from the same place and then it'll stop for a while and then come back on.

When I start the engine, the alternator is atleast charging the battery but the voltage is still very low. Like 12Volts with just the engine on and then it'll dip below 12. The battery warning light has come on as well.
Not sure what I can do.

One thing I think I may have done wrong was the connection to the alternator where there is a nut locking a metal plate with copper wires on it down, on the old alternator it was stuck between 2 nuts but on my new one I just tightened it down under 1 nut. Could that be causing this issue?

Could it be that I didn't tension my belt properly? But the sound is coming even before I turn the engine on.

When I first tried to start the car I did hear some weird noises and quickly turned the car off. Can't remember exactly what they were but maybe some like idk pops or smthing. Tried against and it wasn't there this time.

Any help would be appreciated thanks 🙏

[tere1212]

I have a similar issue the car has a eld to save fuel put it under load it should get you more voltage mine just exploded

[CRC]

I don't exactly know what your problem is, but the Jazz alternator  should be producing between 13.9 and 14.7 volts when the engine is running and the battery needs some charge to run lights, fans etc.

However, the Jazz is also "smart" in that it has an additional circuit inline that will decide whether the battery needs current and if it senses that it doesn't need any, then it switches off the feed used to excite the alternator windings and the battery voltage will drop to around 12.5 volts.

I didn't really believe this but checked it by buyng a cheap USB adaptor that plugs into the cigar lighter that also shows the battery voltage on a small led.

Sure enough, every so often the battery voltage will drop from around 14 volts down to around 12.5 volts as this fuel saving device cuts in.

Turning on the headlights will immediately turn the alternator feed back on as big current flows out of the battery.

If you don't see around 14+ volts just after starting, then something is wrong .... alternator not spinning or faulty or the fuel saving load shedding device has failed in the no charge position.