Battery light comes on at high revs

[Mrricsta25]

Hi all hope everyone had a fantastic easter and ate all the chocolate they could find lol. anyway i have a little issue with my battery light. the battery light is coming on between 2500 and 3500 rpm and the battery does not have the power to start the engine after only a few days (yes this is a brand new battery,well was) the vehicle is a gu 98 y61 with a rd28 motor. im thinking it is just the alternator has died but it seems to have anyone i talk to stumped as to why the battery light would be coming on at high revs. i tookm the car to battery world yesterday and all they could tell me was that the battery was charging under load but not at an idle. any help would be much appreciated. thanks

[Bob]

Check the Battery Connections. Remove clean and replace. Might not be connecting properly all the time.

[Archie]

sounds like the brushes in the alternator are worn out.

[patch697]

I could be wrong here but im tipping its something in the brushs losing contact but this should be able to be checked & tested.

As for the not charging at Idle?

A lot of Patrols fitted with RB30's ran a Bosch alternator & thay are renown for low charge rates at Idle so I would not be overly concerned by that fact if your alternator is Bosch of course.

[Mrricsta25]

I could be wrong here but im tipping its something in the brushs losing contact but this should be able to be checked & tested.

As for the not charging at Idle?

A lot of Patrols fitted with RB30's ran a Bosch alternator & thay are renown for low charge rates at Idle so I would not be overly concerned by that fact if your alternator is Bosch of course.

if i replace the alternator will that come with the regulator???
as for the testing well the service at battery world was pretty poor and did not seem to want to help. also the alternator pully bearing sounds as if it is on its way out so if i can kill the 2 birds with one stone so to speak than that would be one piece of good news for the week

[patch697]

if i replace the alternator will that come with the regulator???
as for the testing well the service at battery world was pretty poor and did not seem to want to help. also the alternator pully bearing sounds as if it is on its way out so if i can kill the 2 birds with one stone so to speak than that would be one piece of good news for the week

Yep it does & given what you said about the bearing noise I'd replace it for sure & if its a Bosch its not that expensive.

I have a TB42 in mine & I converted it from Hitachi to Bosch in under an hr & never looked back.

[Mrricsta25]

thanks patch. looks like im off to get a new alternator this week. will let you all know if this fixes the problem. thanks again

[the evil twin]

Should turn out to be either brushes or a dodgy rectifier diode (altho that usually happens at a lower speed)... Sorry, but I'm not familiar with the 2.8's however most Alternators have an internal Reg these days.

Up to you if you want to get it checked first or just replace it... I'd get it tested... no point buying a new one if it is something else

[Yendor]

It sounds like an alternator problem to me as well, what you need to do is check the charge rate at the back of the alternator with the engine running to confirm.

I also agree with the worn brushes theory or it could be a problem with the brushes springs they might have lost their tension or a full of mud.

As stated above, I would check and clean the main battery connections especially the main earth to the block and the smaller one to the alternator (if the 2.8 have one).

[Finly Owner]

So I would use Ashdown and Ingrams for your alternator, they should be in Townesville. I wouldn't be going back to where I got poor service. Local good auto elec would also be able to get one in for you.

Tim