need battery help!

[gltasn]

ive got 12.5v at battery when parked. when running it says 11.8v at battery and 11.3v on the hhh logger. battery checked out by shop as ok. i just tried a new alt ($250) today and does the same thing. terminals are clean and tight. car idles fine mabey a little higher and had a miss in the exhaust note but, not when listening to engine. what do i look for next?

[DocWalt]

Check the voltage drop in the connections on the starter, the alternator and the battery. Yes, check them again.

[mb7050]

check your ground wires and connection points.

[gltasn]

checked the with 2 diff meters. my battery term has a volt meter and i checked with my battery charger. logger and radar dummy gauge say low. dont have a way to check starter but its months old, starts and runs but i dont want to get stranded.

car ran tits before i r&r the turbos to replace a smoker.

[gltasn]

never even touched them but there still secure!

[DocWalt]

Check the voltage at the starter posts.

If you never touched the connections, they may be dirty. Do itttt :p

[gltasn]

Check the voltage at the starter posts.

If you never touched the connections, they may be dirty. Do itttt :p

do i check while running? the connections are perfect looking. i just built this engine combo months ago. only has 1400 miles since new srtroker and turbos added.

[DocWalt]

Both on and off, and also while cranking. The voltage shouldn't drop a lot. It sounds like a charging issue (bad connection or bad alt.) because the voltage is so low while driving.

[mb7050]

check your fuses too. they might not look blown so check them.

[mb7050]

and run a dedicated ground on the alternator itself and replace all the other grounds on the engine.
i bet its a ground issue.

[gltasn]

fucking fuse! just like me to assume the worst. thx for replys, let the fun making begin,j

[ZKruly87]

nvm. he fixed it

[gltasn]

i guess in my mind i didnt realize there was a fuse for the alt. my mind must have thought since it starts & runs, if there was a fuse, its still must be functioning, but oh well. glad to be driving again! thx for the replys as per usual!

[steve]

If you can, check at the battery and the alternator stud. Both while stopped and when running.
It's easier measuring on both sides of the alternator fuse but that leaves the harness between the alternator and the fuse in question.

While it very possible a new alternator is bad, it's more likely the alternator fuse is blown or the alternator isn't getting the energizing voltage to the L terminal to start with.

I must have missed the second page. Glad you found the problem.

[gltasn]

both(battery post and ecu) at a nice matching 14.1v at idle.