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Old 07-30-2011, 02:45 PM
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Default Why Is My Voltage Dropping?

Six months ago, I did the big 3 with Knu 1/0 wire, and put a HC600 in the trunk. My voltage would idle right about 14v, and with 1kw drop to ~13.4v. I ended up selling my subs/amp at that point, and got new stuff, and was only running ~300w for the last 5 months.

A couple weeks ago the wire I added from my alt to the battery fell out of the terminal at the alt, and melted against the heat shield. Took that off a couple days ago, and re-measured 13.85v idle.

Got new wire from Knu today and redid the alt wire. When I measured the voltage now, it was 13.25v at idle, with the stereo, amps, AC, etc.. off. Turned on the AC, and saw it dip down to 12.8v then quickly went back up.

Could it possibly be due to the heat? Its one of those days that the socket burned my hand after sitting out for the two minutes it took for me to route the wire.
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Old 07-30-2011, 03:12 PM
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sounds like you couldve messed up the alt/ or bat, causing it to not charge properly.
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Old 07-30-2011, 03:24 PM
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is this the guy that sent the DC power alt back but was still working nonetheless?

That is crazy!

You should have your alt charging cable fused for protection.

ensure you have 1-2 grounds coming off of alt to battery or chassis.
Good ground at starting battery.
Definitely good power run from alt to starting battery.
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Old 07-30-2011, 03:52 PM
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Quote:
Originally Posted by shizzzon View Post
is this the guy that sent the DC power alt back but was still working nonetheless?

That is crazy!

You should have your alt charging cable fused for protection.

ensure you have 1-2 grounds coming off of alt to battery or chassis.
Good ground at starting battery.
Definitely good power run from alt to starting battery.
No, and no idea who you are talking about.

I have a 300amp fuse about 6in from the battery.

The grounds would be two of the Big 3 which I did.

It was doing fine for the 5 months or so. Not sure how the wire came out of the terminal a couple weeks ago (didnt even know it did till the other day when I took it off).

What I dont get is why there was a .6v drop from adding the wire back to the alt. Unless it has to do with the heat.
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Old 07-30-2011, 03:58 PM
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the way you are wording it is making no sense.

Are you saying if u do not add wire you get a certain voltage but as soon as you add a run of wire, it drops?

If that's true, there is something wrong with your connections at point A and B.
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Old 07-30-2011, 04:37 PM
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If the power wire was grounded for some time you probably damaged the HC600. Once the batteries was reconnected it put a strain on the alt. Try disconnecting the wire that connects to the alt and see if voltage goes up.
Also have you tried charging the batteries individually?
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I think it's probably because that sub is not moving enough to allow it to cool.. Id turn the gain up a bit so it moves more for cooling reasons.. That's why it's hard on subs to be underpowered..
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Old 07-30-2011, 04:48 PM
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Quote:
Originally Posted by audioarsonal View Post
If the power wire was grounded for some time you probably damaged the HC600. Once the batteries was reconnected it put a strain on the alt. Try disconnecting the wire that connects to the alt and see if voltage goes up.
Also have you tried charging the batteries individually?
Ill try disconnecting it again and see where its at.

There was a 300amp fuse between the wire that fell and melted, and the main battery, and the fuse never blew.
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Old 07-30-2011, 05:35 PM
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Before I un-did it, I checked again. 13.24v front and back. Disconnected the new wire, and was getting 13.85v, front and back. Left the new wire on the alt, just disconnected from the battery, and that wire was reading 13.95v. I stripped back some more of the wire going in to the fuse holder, and blew off the battery terminal a bit, put it back on, and now its back up to 13.94v.

Flicking on my brights it drops to 13.05v for a split second, and the AC drops it to 12.9v before it goes back up to 13.8v.

Turning the stereo and amps on only drops it .01v.
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Old 07-30-2011, 06:04 PM
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sounds like ur alt is going bad. get it tested and check all connections
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Old 07-30-2011, 06:32 PM
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Quote:
Originally Posted by yotabass1 View Post
sounds like ur alt is going bad. get it tested and check all connections


How did you figure that?
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