high amps at idle, voltage drops as rpm's increase

[integra88 10+ year member]

I have always found that alternators do not put out more voltage when they spin faster. Some put out more at lower revs. Comp. alts are designed to put out more power at idle than at faster revs. It depends on your specific alt. Contact a Chev. dealer and talk to someone in the service dept. They can let you know where in your rpm range your alt. puts out the most power. Hope this helps.//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[MEMPHISFLEX 10+ year member]

why would i unhook it?

To see how the alt charges with out haveing to charge your extra battery in the rear, thats why, see how it does just being stock!

 

[blackbonnie 5,000+ posts]

I have always found that alternators do not put out more voltage when they spin faster. Some put out more at lower revs. Comp. alts are designed to put out more power at idle than at faster revs. It depends on your specific alt. Contact a Chev. dealer and talk to someone in the service dept. They can let you know where in your rpm range your alt. puts out the most power. Hope this helps.//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

yeah i think my stock alt is a competition one. i think thats what chevy was shooting for

 

[blackbonnie 5,000+ posts]

To see how the alt charges with out haveing to charge your extra battery in the rear, thats why, see how it does just being stock!

it did fine, i just put the second bat in yesterday and took off the engine block to chassis big 3 yesterday. so i was just wondering why i have higher amps at idle then at 3000 rpms

 

[rumple4skin 10+ year member]

really sucks man but i would seriously love it if you pmed me and told me what was wrong for future advice giving=)

 

[integra88 10+ year member]

My stock Integra alt. puts out it's max power at 2000 RPM's. When driving my voltage actually drops to around 13.3v and at 2000 it shows 14.3v.

 

[blackbonnie 5,000+ posts]

really sucks man but i would seriously love it if you pmed me and told me what was wrong for future advice giving=)

will do

 

[rumple4skin 10+ year member]

ho alts are just like amp raitings if it sets at 200 idle then it will hit 300+ in motion most of them will have a max output raiting on them, say something like 200-600

 

[blackbonnie 5,000+ posts]

My stock Integra alt. puts out it's max power at 2000 RPM's. When driving my voltage actually drops to around 13.3v and at 2000 it shows 14.3v.

good info

 

[rumple4skin 10+ year member]

and iv seen guys run two bats off of a 65 amp alt before fyi

 

[blackbonnie 5,000+ posts]

and iv seen guys run two bats off of a 65 amp alt before fyi

yeah me too, thats why i thought it was weird because i wouldnt think it would put much more strain on the charging system

 

[missinglink 10+ year member]

What you are seeing is the GM's computer is giving that signal to the alternator. The newer GMs 03-07 has a 80% charge control. One wire tells the alternator to charge the other line comes back to the computer with draw info. This signal from the car more or less regulates the regulator in the alt. This is why you are seeing the drop its set @ 13.8v or so as the alternator gets hot it tends to compensate by the lower voltage. Hope this helps.

MLA

 

[maldecido33 10+ year member]

im not sure, what would it be?

It's a 140amp alternator; I have the same year model and make truck.

 

[blackbonnie 5,000+ posts]

What you are seeing is the GM's computer is giving that signal to the alternator. The newer GMs 03-07 has a 80% charge control. One wire tells the alternator to charge the other line comes back to the computer with draw info. This signal from the car more or less regulates the regulator in the alt. This is why you are seeing the drop its set @ 13.8v or so as the alternator gets hot it tends to compensate by the lower voltage. Hope this helps.
MLA

and you sound like you know your stuff so i am gonna go with that answer //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif . even though its your first post, ive never heard of that. so what happens if someone has bad voltage drop...does the alt kick it into high gear even at idle and keeps it around 13.8?

 

[missinglink 10+ year member]

It will drop my was dropping to 11v. The kicker is that 13.8v charge will leave your batteries under charged. Thats the 80% rule by GM. The newer GMs are not audio friendly for sure.

MLA