Lower reading on Volt gauge after fitting new alternator??

This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
hammoj28

hammoj28

Active Member
Posts
786
Location
Awa in the hills a-chasing the deer
My alternator finally gave up the goose the other day, so just fitted a new one.

Started it all up and it seems to work, can turn on all the lights etc etc, start and stop it as much as I want.

However, the volt gauge is now only reading just above red on the low side. It used to sit at just a tick over half way.

I checked the voltage at the big terminal on the alternator and its 11....something.lol. Cant remeber off the top of my head tbh. So that sounds ok to me.

Any ideas?

Im a bit stumped tbh.

Cheers

James
 
Yeah, somethings not right. I mean it works and charges and starts it fine.

Just checked, the alternator I removd is an A127/65. The alternator that iv been supplied with is an A133/80. Would that make a huge difference?
 
it depends on the amps as well so what amp is the new one putting out ??
The tick over voltage should be a lot higher it need to be between 13.6 v olts and 14.4 volts under load with engine running, If you are getting this the i would suspect there is something wrong witht the alternator
 
Most likely you've not connected the exciter wire up properly, or broken it in the process.
 
Also possible that the new alternator has a faulty regulator or an internal fault. You'd need to get it tested to find out properly, though.
 
hammoj28 said:
Just checked, the alternator I removd is an A127/65. The alternator that iv been supplied with is an A133/80. Would that make a huge difference?
Click to expand...
Well it should make a positive difference - not a negative one! That second figure is the ampage, so the one you took off is 65 amp and the new one should be 80 amp. Apart from the fact that it's not working properly, was it a direct replacement?
 
instantsquid said:
Well it should make a positive difference - not a negative one! That second figure is the ampage, so the one you took off is 65 amp and the new one should be 80 amp. Apart from the fact that it's not working properly, was it a direct replacement?
Click to expand...

Hmmm, as in direct replacement yes it is. It bolted straight up.

Im guessing I must have a fualt alternator......balls.
 
I changed it because, it started to sound like a supercharger and got so hot you couldnt even touch it. It was still charging tho. Spoke to a guy who rebuilds them and he says it sounds like the main winding is screwed and it cant be rebuilt...

However, since it was still charging i swapped it back on today and everything works so its got to be the new alternator. Got another on its way.
 
The bearing behind the fan on the alternator [normaly plain] can get dry,try running a bit of oil down the back of the fan and see if the noise goes away.
 
Well, went through 3 alternators that didnt work. Moral of the story, dont buy britpart I guess. Seems they have a bad batch at the moment.

Bought a second hand one for 20quid and it works spot on. 14.3 V.

Think the next time im just going to get things rebuilt if I can. Id prefer a rebuilt genuine item than a new cheap item if possible and it'll prob cost the same.
 
You must log in or register to reply here.

Similar threads

W
Temperature gauge reading high.
2
Replies
20
Views
2K
Benallum
B
H
Unknown connector under the alternator
Replies
5
Views
470
Nodge68
Nodge68
R
Fuel gauge reading empty
Replies
9
Views
912
resto_d1
R
R
Fuel gauge level.
Replies
1
Views
681
Brown
Brown
A
Disco 2 TD5 New alternator not charging (solved)
Replies
2
Views
2K
Abaddon
A
Back
Top