alt fried?

[09civic 5,000+ posts]

my friend just jump started me and everything was working when i was still connected to his battery. as in the speedometer etc. once i got off his battery. my battery read 7 volts

does this mean the alt of batt is the problem?

 

[bubbagumper6 5,000+ posts]

my friend just jump started me and everything was working when i was still connected to his battery. as in the speedometer etc. once i got off his battery. my battery read 7 volts
does this mean the alt of batt is the problem?

What does your batt read when the car is off? If it's reading 12V then it's definitely the alt.

 

[09civic 5,000+ posts]

What does your batt read when the car is off? If it's reading 12V then it's definitely the alt.

its reads 11.9- 12.0 and when i try to start it, it'll go down to 10.4. could it have a dead cell?

 

[MONSONwarrior Premium Member]

its reads 11.9- 12.0 and when i try to start it, it'll go down to 10.4. could it have a dead cell?

is your positive terminal all the way on? mine did that for awhile before I was smart enough to look at the battery terminals.

 

[sacsking916 5,000+ posts]

test em. pull the battery and take it to get tested.

 

[09civic 5,000+ posts]

is your positive terminal all the way on? mine did that for awhile before I was smart enough to look at the battery terminals.

yea its good.

 

[bubbagumper6 5,000+ posts]

its reads 11.9- 12.0 and when i try to start it, it'll go down to 10.4. could it have a dead cell?

Ehh, idk that sounds more like the alternator to me, like the regulator is bad.

 

[MONSONwarrior Premium Member]

Ehh, idk that sounds more like the alternator to me, like the regulator is bad.

that would keep it from charging the battery, then under the load of starting it, or even the load of the dome lights it'll drop to where it is.

 

[mast240 10+ year member]

yea your alt is prolly fried... even with a bad cell, a batt would read above 13v when running, AND then jump down in voltage when your car is shut off

 

[09civic 5,000+ posts]

alright. so no place around here will install alts....so im juss gonna have to do it myself. will i need any additional parts to instal a new one?

 

[bubbagumper6 5,000+ posts]

that would keep it from charging the battery, then under the load of starting it, or even the load of the dome lights it'll drop to where it is.

No I was thinking more like, the alternator's regulator was actively dragging down the voltage, like an internal short or something.

 

[bubbagumper6 5,000+ posts]

alright. so no place around here will install alts....so im juss gonna have to do it myself. will i need any additional parts to instal a new one?

Make sure the new alt comes with a new pulley (you'll never get the old one of the old alt). The only other thing you may need is a new serpentine belt if the new pulley is drastically sized differently then the old.

 

[sacsking916 5,000+ posts]

alright. so no place around here will install alts....so im juss gonna have to do it myself. will i need any additional parts to instal a new one?

maybe a belt. and for the record an alt has nothing to do with starting. did you test your bat???

 

[sacsking916 5,000+ posts]

Make sure the new alt comes with a new pulley (you'll never get the old one of the old alt). The only other thing you may need is a new serpentine belt if the new pulley is drastically sized differently then the old.

i take old pulleys off daily bro. its really not that much work. now if your saying for him its a challenge to get the old pulley off then yeah. but most newer aged alts come ready to go pulleys installed.

 

[bubbagumper6 5,000+ posts]

i take old pulleys off daily bro. its really not that much work. now if your saying for him its a challenge to get the old pulley off then yeah. but most newer aged alts come ready to go pulleys installed.

Yeah, HE will never get it off. When I bought an HO alt from Knu it didn't come with a new pulley and we tried for hours to get the old one off the old alt. It was a mess, my car ended up being laid up for days while we waited for a new pulley.