RIDICULOUS Voltage Drop, help me out guys.

[PhatTonyDeMarco 5,000+ posts]

This is how things currently stand with the headunit on and the profile trying to play:
Volts at Battery and alt: ~14V

Volts at profile positive/ground terminals: ~7v when powered on, 14v when not powered on.

This is the oddest thing I have ever seen...

 

[Defconx3 10+ year member]

Maybe you have a pair of speakers wired wrong and have the wrong impedance for the amp than you want, causing high current draw?
What exactly has changed since you disconnected the Directed? You added the Profile amp?

I already checked the wiring and even disconnected all but one channel, which was hooked up to a speaker right in front of me, same thing.

Before this install I was running the crappy lightning audio amp, and my speakers were coax, powered by the headunit. Since then I installed infinity components, a pioneer deh-p860mp, the directed 1500d, and switched out the lightning audio amp with the profile.

The thing that has me confused is that I have connected that 4 channel amp last week to the same wiring when I went and picked up some iridium 6.3's, and it worked fine.

 

[Defconx3 10+ year member]

This is the oddest thing I have ever seen...

Agreed.

 

[negativezeroz 5,000+ posts]

have you tried just connecting PWR, GND, and remote to the profile then seeing if it reads 14v? cuz if so then it is your wiring tospeakers...

 

[Blazin_Jason 10+ year member]

If you have the same power wire running as before, did you change the ground wiring at all? Just a thought that there is just enough ground connection for you to read full voltage with no load. Then with the amp trying to draw power its unable to make a complete circuit. No loose fuse right? =)

Jason

 

[Defconx3 10+ year member]

have you tried just connecting PWR, GND, and remote to the profile then seeing if it reads 14v? cuz if so then it is your wiring tospeakers...

I tried reading the pwr/gnd voltage at the profile terminals and it reads 14v when I have it off, but 7v when I have it on. It cannot be the wiring to the speakers that is screwed up because I tried disconnecting all but one channel which I know for a fact is correctly wired, and it resulted in the same thing.

 

[Defconx3 10+ year member]

If you have the same power wire running as before, did you change the ground wiring at all? Just a thought that there is just enough ground connection for you to read full voltage with no load. Then with the amp trying to draw power its unable to make a complete circuit. No loose fuse right? =)
Jason

Yeah, thats all thats left that I can think of. I am going to re-ground it in another location and replace the fuse.

 

[PhatTonyDeMarco 5,000+ posts]

Is everything else in your car working properly when there is this 7v read out? With 7v to your car's electronics there should be some major dimming... If not then I would say it is most deffinitly a grounding issue.

 

[Defconx3 10+ year member]

Is everything else in your car working properly when there is this 7v read out? With 7v to your car's electronics there should be some major dimming... If not then I would say it is most deffinitly a grounding issue.

No dimming, its gotta be the ground. I'm going to go change it.

 

[TooLowTooGo 10+ year member]

thats what im thinking.. could be the ground.

 

[unbonyr 10+ year member]

yea i agree its the ground becuase no way those two amps are ******* that much power becuase my freind has that same directed amp with no cap no nothing and he has minimal voltage drop little headlight dimming but thats it there very effienct amps to when we hooked up a cap to it just to read the voltage output ran the system for about 20 min and with heavy rap bass hits the lowest voltage we saw was 12.8 so theres no way a little 40 amp profile is going drop you from around the high 12's to 7 volts its just not possible well maybe if your alternator is like 20 amps or something

 

[Defconx3 10+ year member]

Yeah, im too tired to change it tonight, but i'll do it first thing tomorrow when I wake up. Im planning on busting out the dremel and making some fine grounds. I doubt I will still have a problem after that. I'll keep you guys posted.

 

[knukonceptz 10+ year member]

Seems to be a bad connection, one that can not handle a load (usually points to a bad ground)

 

[Tehgregzor 10+ year member]

sorry to thread jack, but what battery do you have that puts out a constant 14.7 volts? all i can ever find are 12 volts batts. maybe i'm just reading wrong or something....

 

[knukonceptz 10+ year member]

All batteries are 12V (with a few exceptions), with the car running it should read 14.4V or so depending on car manufacture.