Will the lower pulley mod affect how the battery charges?

[Khabel]

My car had a smaller lower pulley already installed when I purchased it and I have noticed that the battery loses its charge after a couple days of sitting idle.

Could this be due to the pulley mod not charging the battery fully when the car is running or more likely a battery/alternator issue?

 

[mpower]

what's voltage like when car is running?

 

[Khabel]

Usually shows around 13 or 14 on the display

 

[mpower]

then it just sounds like the battery isn't holding charge OR there is a drain from somewhere.

 

[Grennan]

Are you referring to an underdrive pulley?

Also, Mpower, the VEs typically sit around the 13 mark. Theyre just ####en power hungry.

 

[Khabel]

Are you referring to an underdrive pulley?

Also, Mpower, the VEs typically sit around the 13 mark. Theyre just ####en power hungry.

Yes, underdrive pulley

 

[ducker85]

Yes, underdrive pulley

They spin the pulleys slower so in theory yeah the alternator will turn slower too, how that affects the charge you'd think it be less too

 

[S.D.M.F]

How Alternators Work - HowStuffWorks

https://www.powerbastards.com/articles/underdrive_crank_pulley.asp

 

[Immortality]

Which size under driven balancer do you have? IT will effect battery charge as the alternator isn't spinning as fast. Would be more of a problem if you are only doing short trips and spend a lot of time idling.

A good solution is to fit some diff gears to get the revs up

Have you tried charging the battery to see what happens? It may be you also have a battery drain issue with something not turning off? I thought VE's had charging issues, didn't Holden upgrade the software to fix the charging issue?

 

[ducker85]

didn't Holden upgrade the software to fix the charging issue?

OP isn't in Australia tho but maybe his Chev dealer can provide the update?