Batt reading strange

[fearlessgangsta 12]

So I go to put my 3400 in after charging. It took it off the charger put it in the car check it with a DMM and reading 13.7v or so. So I hook everything up and start the truck.

Voltage reads 15.1 then down to 14.8 on my stinger meter.

I go to check my 3400 with a DMM and it reads 13.78v WTF. So I check my amp wires they read 14.8 WTF. So I check the 3400 again it still reads 13.78-13.79. Then I check my stock it's reading 14.8.

My wires are ran like this

Alt POS to POS on 3400

Alt POS to POS on stock

POS from 3400 to POS on amp.

My questions are. Is my amp wires reading 14.8 but my 3400 is reading 13.78?

Is it because my 3400 is fully charged so it's not accepting the charge are something?

Edit: So I went out and batt was resting at 13.17. Start the car it creeps up .1 by .1 to 13.30. I'm talking 13.17 1 sec later 13.20 1sec later 13.21ect. Ran over and checked stock and it was at 15.0 I then shut the car down.

Edited April 28, 2012 by Fearz

[shizzzon 461]

check fuse(s) on your front to rear power wire run.

If it's not that, then it's this-

You have what i try and preach to people 10,000x is we, car audio community, cannot just rely on the framework of a vehicle as the "perfect" ground.

You are experiencing a full 1 volt drop from front to rear.

You want to test this for free without installing anything?

Get you a set of jumper cables. You need only use the ground side.

Attach the ground clamp to ground post on D3400.

Attach other end to ground post on stock battery, alt casingbracket or as close to the battery or alt ground as possible.

Your voltage should instantly skyrocket.

Ifwhen it does, you need to run a ground cable from front to rear of the stock batt to rear batt ground.

[Shogen 325]

Strange...

Edited April 28, 2012 by Shogen

[fearlessgangsta 12]

check fuse(s) on your front to rear power wire run.

If it's not that, then it's this-

You have what i try and preach to people 10,000x is we, car audio community, cannot just rely on the framework of a vehicle as the "perfect" ground.

You are experiencing a full 1 volt drop from front to rear.

You want to test this for free without installing anything?

Get you a set of jumper cables. You need only use the ground side.

Attach the ground clamp to ground post on D3400.

Attach other end to ground post on stock battery, alt casingbracket or as close to the battery or alt ground as possible.

Your voltage should instantly skyrocket.

Ifwhen it does, you need to run a ground cable from front to rear of the stock batt to rear batt ground.

Both batts are in front sir. I personally think its the ground my self. Didn't tie it into my other grounds. I'll try to find some jumper cables.

[fearlessgangsta 12]

My 3400 did the same thing on the charger. Started 12.7 1sec later 12.8 1sec later 12.9 1sec later 13.0ect.

[shizzzon 461]

when u say amp wires.. i'm assuming you are measuring this directly at the amp.

So, stock batt = 14.8v

other front batt(d3400)= 13.8v

amp in the back= 14.8v

Your amp is grounded to frame of vehicle.

Your amp's power cable is in a circuit with the alternator, the D3400 and the stock batt.

this allows your amp to see 14.8v.

For your D3400 not to see 14.8v, it must not be grounded to the frame at all...

this is NOT ideal.

I would ground the D3400 to the frame, possibly to the same point the alt's Big 3 ground point is for best location.

[CrazyKenKid 64]

sounds like a grounding issue also what is the stock battery reading?

[fearlessgangsta 12]

sounds like a grounding issue also what is the stock battery reading?

14.8

[fearlessgangsta 12]

when u say amp wires.. i'm assuming you are measuring this directly at the amp.

So, stock batt = 14.8v

other front batt(d3400)= 13.8v

amp in the back= 14.8v

Your amp is grounded to frame of vehicle.

Your amp's power cable is in a circuit with the alternator, the D3400 and the stock batt.

this allows your amp to see 14.8v.

For your D3400 not to see 14.8v, it must not be grounded to the frame at all...

this is NOT ideal.

I would ground the D3400 to the frame, possibly to the same point the alt's Big 3 ground point is for best location.

Tried the Jumper cable trick and Fixed it right up. Feels bad that I ran it for a week or so like that. Just ordered about 3feet of Knu and a couple of terminals to get this Fixed. Thanks Shizzz