ABS light comes on while I hit the brakes, & really low voltage readings

[GettinPaper]

First off i want to start out that my car has had really low voltage readings of around 11.3 or so at idle from what i can read from my electronic boost controller... While doing a turbo swap i forgot to remove the battery cables (dumb me) and grounded the alternator.... I ended up getting a new one and put everything back together thinking it would fix my low voltage readings from before.... But no it still reads around 11ish and now my ABS light comes on every time i hit the brakes and kind of makes a grinding feel in the brakes for a second then stops.. ( I have a new alternator and i have a year old red top optima battery) I haven't checked the fuses since i grounded out the alternator.. Would that cause the ABS to freak out like it is??? And what would cause my car to have such low voltage readings with a new alternator and pretty new battery??

Any help is MUCH appreciated thanks alot

 

[Hovertac]

Are you getting 11.3v directly from the battery?

Also, did you only get a new alternator or a battery too?

 

[GettinPaper]

Are you getting 11.3v directly from the battery?

Also, did you only get a new alternator or a battery too?

I am getting the reading from my electronic boost controller, not from the battery.. And i just got a new alternator, and i bought the red top optima battery about a year ago

 

[Hovertac]

I am getting the reading from my electronic boost controller, not from the battery.. And i just got a new alternator, and i bought the red top optima battery about a year ago

Oh, well, if you have a multimeter I'd check the voltage directly from the battery.

 

[GettinPaper]

Oh, well, if you have a multimeter I'd check the voltage directly from the battery.

I'm not too good with electrical , I barely know how to use my multimeter.. I'm going to check the voltage from the battery what should it be?

 

[Hovertac]

I'm not too good with electrical , I barely know how to use my multimeter.. I'm going to check the voltage from the battery what should it be?

A good battery should be over 12.5v.

 

[GettinPaper]

A good battery should be over 12.5v.

Well i went and tested it with my multi meter and it read a little above 10volts and the next voltage reading on my multimeter was 16volts. so I think its good.. i don't know what would cause this...

 

[Hovertac]

Well i went and tested it with my multi meter and it read a little above 10volts and the next voltage reading on my multimeter was 16volts. so I think its good.. i don't know what would cause this...

So it read 10 then 16? Those are both bad readings. I personally say no less than 12.5 and no greater than 13.5.

 

[GettinPaper]

So it read 10 then 16? Those are both bad readings. I personally say no less than 12.5 and no greater than 13.5.

My multimeter is cheap and the readings go from 10volts and the next closest reading is 16 and it was hovering above the 10volts

 

[Hovertac]

My multimeter is cheap and the readings go from 10volts and the next closest reading is 16 and it was hovering above the 10volts

Oh, you meant the range on the multimeter can be 10v or 16v?

If so, check battery voltage on the 16v setting.

 

[GettinPaper]

ended up being my alternator fuse, it was blown but to the point where you couldn't tell untill you unbolted it and took it out and it fell apart.. .. everything is good to go now!

 

[Hovertac]

ended up being my alternator fuse, it was blown but to the point where you couldn't tell untill you unbolted it and took it out and it fell apart.. .. everything is good to go now!

Glad to hear and glad I was able to be of some help.