amplifier not reading voltage properly??

[Falcons 5,000+ posts]

i hooked up a new head unit today and it sounds great but when i plug in the dmm i dont get any voltage. and when i do get the proper voltage i need (14.1) the head unit is almost all the way up and then the voltage jumps from 12.2 to 15.3 to 14.2 to 11.2 and so on. what am i doing wrong? the head unit is on flat and nothing is up just like its supposed to be and everything else is wired up correctly. the amps power on button isnt lighting up either, however the amp works. the head unit is a pioneer deh-6300ub. any advice???

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[Kangaroux 5,000+ posts]

do you have a short somewhere? batt is good? try grounding the RCA's on the HU just in case something is shorting

 

[adio25 10+ year member]

Sounds like a problem with power wire or ground.

 

[Falcons 5,000+ posts]

I checked the power wore and it was pinched but I fixed it so it wasn't the problem. I tried moving the ground wire to a different location and that didn't do anything. I tried another amp that didn't work. And I tried another dmm and that didn't work either

 

[CRXBMPN 5,000+ posts]

where are you putting the multi meter? your title suggests amplifier, but your talking about a head unit. Are you looking for battery voltage or voltage going through your rca's or perhaps off the amp speaker terminals going to the sub? I'm slightly confuzzled.

 

[lilpride 10+ year member]

Yea your post is real hard to read. Testing voltage with a dmm means just touching it to an end. You need to reword that first post. Where are you trying to read the voltage from?

 

[vaiboy 10+ year member]

It sounds like you are trying to set the gains with a DMM, but you are playing music instead of a test tone.

 

[Falcons 5,000+ posts]

i figured it out. the ground was **** and i replaced it. i was using a test tone but it was so bad of a ground it didnt complete the voltage. i was testing to set the gains by the way.

 

[Phoenix Risen 10+ year member]

where did you have the leads touching?