weird voltage drop...

[BeAlLsTaR13 10+ year member]

i noticed today, that my voltage seemed VERY low, like between 12.1-13.3.. usualy my voltage is around 14.0-14.2 @ idle after start... my voltage was dropping low even with the volume very low, around 5.. then i turned the HU off, and it shot straight back up to 14.2 volts.. so i turned the HU on, this time with no music on at all, and it dipped back down into the lower 13's.. turned the HU off, shot straight back up to 14.2 volts..

any reason why this is doing it? its ONLY when the HU is on.. with or without music, and with music it gets into the mid to lower 12s... sometimes dipping to 11.8 volts...

Click to read more...

 

[BeAlLsTaR13 10+ year member]

anyone?

 

[bones22 5,000+ posts]

bad/loose connection somewhere

dead cell(s) in your battery

alt issue

 

[BeAlLsTaR13 10+ year member]

bad/loose connection somewheredead cell(s) in your battery

alt issue

well, it just started happening.. like today

 

[bones22 5,000+ posts]

all of those things cappen happen out of nowhere.

 

[BeAlLsTaR13 10+ year member]

well, if anything.. it would be the alt (at least i think it would be)

any way to test to see if anything is wrong with it?

 

[bones22 5,000+ posts]

go to autozone or whatever. they will test it for free

 

[BeAlLsTaR13 10+ year member]

hmm alright

but my main question is.. how come its ONLY when i turn the HU on?

 

[BeAlLsTaR13 10+ year member]

oh and also, i upgraded (well at least thought it was an upgrade) my main power wire run from knu fleks 4g wire to 1/0g wire just 2 days ago if that has an effect on anything

 

[tristanmay 10+ year member]

i had the same thing happen to a friend with a headie, turned out there was like a short or somthing that must have been discharging some power. try putting the stock or another one in quick

 

[bones22 5,000+ posts]

hmm alright
but my main question is.. how come its ONLY when i turn the HU on?

that sounds more like a loose connection or maybe shorted somewhere

 

[BeAlLsTaR13 10+ year member]

that sounds more like a loose connection or maybe shorted somewhere

where abouts should i begin to look?

 

[bones22 5,000+ posts]

pull the h/u

hook up a different one if you can to see if it does it to.

 

[jpexpc 10+ year member]

pull the h/uhook up a different one if you can to see if it does it to.

Ehh, I hate to disagree but I think that would be the last thing to do, if at all. Check your wire for shorts. If you just redid the wire you may have a loose connection somewhere or a bad fuse connection.

 

[ejschultz 10+ year member]

If it's only with the hu turned on, not the air or any other accessory, it's not the battery or alternator. The air may drop it a little, but not to the levels you're getting. I would pull the hu and check the wiring connections. You may have had something come loose. Even if you don't see anything loose, redo all the connections. That should only take about 15 minutes. If that doesn't fix it, check the new power wire you ran. It sounds like a wiring problem withthe hu though.