Bought new 250amp alt but same voltage drop?

[Papermaker85 5,000+ posts]

Buy the way don't use CCA. It *****. Its not much better that aluminum. Use pure copper.

In 1/0 ccaw can carry 170 amps vs coppers 225

 

[Papermaker85 5,000+ posts]

Test the resistance between the battery grind and the wire where it goes into the amp( pull the ground out and put one lead on the wire itself and the other directly to the battery.

 

[NASTY08IMPALA 5,000+ posts]

Buy the way don't use CCA. It *****. Its not much better that aluminum. Use pure copper.In 1/0 ccaw can carry 170 amps vs coppers 225

1/0 cca carries 250a and ofc is 300a ..ur way off ....i have the same amp along with a 800rms ab 4 ch ...mechman 240 with 4 runs of cca ..i have 290ah worth of batts.externally regulate to 15v and i drop to 14.2 full tilt..he has a problem

 

[Crownvicon28s 10+ year member]

More than likely a grounding issue or a dead battery.

 

[1-12-t1 10+ year member]

today running a second neg run from front batt to the bank in the back, and Im going to add a second neg run from bank to chassis. Give you guys an update probably tomorrow. Thanks for all the imput

 

[fatboytyler]

most likely your ECU, same shiet with my high output alt.

What year of vehicle? Most voltage regulator ECU's are built into the alternator nowadays.

 

[C1500martin 10+ year member]

Let me know what helps i just installed my singer 320 6phase and im having the same issue sits at 14.8 but when bass hits 12.3 wtf man!

 

[NASTY08IMPALA 5,000+ posts]

Let me know what helps i just installed my singer 320 6phase and im having the same issue sits at 14.8 but when bass hits 12.3 wtf man!

U guys do know that thes ho alts dont put out much more power than a stock alt at idle..they dont start putting out power till 1200-2krpms..at idle u are basically running on battery power ..if ur dropping that low that fast u probably dont have enough batt reserve

 

[1-12-t1 10+ year member]

Guys thanks for the help, you were right I had to add another neg run.

I was going from low 12's full tilt to 13.1 full tilt. I actually only had 2 runs of pos no neg runs, so now its 2 pos 1 neg.... but not only steadier voltage but a good bit louder. Thanks to all who put in info.

And I have a 2006 expedition, how would I turn up the ecu?

 

[yogegoy]

I'm surprised you didn't have the installation addendum for the negative cable, do you have the tag where your full output is officially written?

 

[NASTY08IMPALA 5,000+ posts]

Guys thanks for the help, you were right I had to add another neg run.
I was going from low 12's full tilt to 13.1 full tilt. I actually only had 2 runs of pos no neg runs, so now its 2 pos 1 neg.... but not only steadier voltage but a good bit louder. Thanks to all who put in info.

And I have a 2006 expedition, how would I turn up the ecu?

U cant you should have ordered a externally regulated alt.sk u could charge at a steady 14. 8-15v

 

[Based]

So you have a run of negative from front battery to back battery and that made your voltage drop less? Right now I have a 320a singer alt and I get voltage drop still too. I'm gonnna put a little smaller belt on it. I have a 20ft run of 1/0 cca on me and a couple terminals... do you think running a run of that from front negative to back negative would help any? Right now I just have my back battery grounded to my chasis.

 

[NASTY08IMPALA 5,000+ posts]

So you have a run of negative from front battery to back battery and that made your voltage drop less? Right now I have a 320a singer alt and I get voltage drop still too. I'm gonnna put a little smaller belt on it. I have a 20ft run of 1/0 cca on me and a couple terminals... do you think running a run of that from front negative to back negative would help any? Right now I just have my back battery grounded to my chasis.

Yea u cant run that much power without negative runs ...for 4-5k id suggest 2 runs of pos and 2 runs of neg ...and if ur talking about voltage drop at idle ..theres not much u can do abt that

 

[Based]

Yea u cant run that much power without negative runs ...for 4-5k id suggest 2 runs of pos and 2 runs of neg ...and if ur talking about voltage drop at idle ..theres not much u can do abt that

Nah not idle I do get a lot at idle but this is more what I'm talking about:

https://www.youtube.com/watch?v=f49qGCwYpGo

Skip about a minute in or something to get to the good stuff.

 

[NASTY08IMPALA 5,000+ posts]

Nah not idle I do get a lot at idle but this is more what I'm talking about:
https://www.youtube.com/watch?v=f49qGCwYpGo

Skip about a minute in or something to get to the good stuff.

Thats hardly any drop at all ..whats ur problem? U will never have 0 drop ..14.9 to 14.1 is pretty **** good..my electrical is great and i drop to 14. 2 from 14.9