220a Alt... STILL getting voltage drops! WTF?!

[OoMesKoO 10+ year member]

I just bought a Iraggi 220a amputator series alt. At full tilt, I still see voltage drops down to around 10-11v. Now my question is, is it because I am only running 1 stock battery? Would adding a second solve my problems? I figured with 175a at idle speed, I would more than cover what my stock battery wasnt supplying. Maybe im wrong?

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[geowick07 10+ year member]

Stock battery may be holding the electrical back. Is the Big 3 done?

 

[OoMesKoO 10+ year member]

Yessir. I have the big 3 done all in 0/1 awg.

 

[Tacosys 10+ year member]

This is what everyone fails to realize. H.O. alternators put out very,very little at idle. Rev that ***** up to 1500-2k rpm's and see what happens.

 

[king ranch 5,000+ posts]

how much power are you running

 

[OoMesKoO 10+ year member]

This series is said to produce 175a @ idle speed.

 

[OoMesKoO 10+ year member]

around 3200w

 

[blazeplacid 10+ year member]

rev it up definatly

 

[icpurplepplalot 5,000+ posts]

Your amp is pulling more than the 175 amps you have at idle. You should replace your stock battery, plus have another in the back.

 

[Ali1 10+ year member]

have someone rev it to 2k rpm while you use your DMM to check ur drops.

although your running 3200watts, 10-11 still seems too low for an alty that does 175 at idle

 

[audioholic 5,000+ posts]

Also make sure all your connections are good and clean. Excessive resistance in the circuit would cause excessive voltage drop under load also.

 

[skmfkr 5,000+ posts]

Also make sure all your connections are good and clean. Excessive resistance in the circuit would cause excessive voltage drop under load also.

yeah especially with a bad ground, not getting the power back to the battery

 

[ProgMtl 10+ year member]

Should've got a bigger alt....I only have about 2000watts and I'm still seeing 14.3volts at my amps with them all the way up...I have done the big 3 and only have a Red Top under the hood with the alt. in my sig. (which is also 175amp @ idle)

 

[audioarsonal 10+ year member]

Might need a smaller pulley on the alt.Does the voltage drop when you slow down or is it just from the music?

 

[ProgMtl 10+ year member]

Dom usually puts a smaller pulley on his alts