Sundown SA-12 and Hifonics BRX1100.1D: I did something wrong?

[Golitan11]

But is it normal that I still have no voltage drop at all (engine on) with a stock 80A alternator, stock battery and Big 3 (Stinger volt meter showing around 14 when I start the vehicle and around 13,6 after an hour or two)? I have some (like 0.5V drops) but they are very unfrequent and seem to come very randomly (sometime it does and sometime it not even if I play the same part of a song). However, the voltmeter is working fine because I tested with a DMM too and it is showing the same thing.

 

[Jeffdachef 5,000+ posts]

But is it normal that I still have no voltage drop at all (engine on) with a stock 80A alternator, stock battery and Big 3 (Stinger volt meter showing around 14 when I start the vehicle and around 13,6 after an hour or two)? I have some (like 0.5V drops) but they are very unfrequent and seem to come very randomly (sometime it does and sometime it not even if I play the same part of a song). However, the voltmeter is working fine because I tested with a DMM too and it is showing the same thing.

Yeah its normal, most of the times where people have bad voltage drops is because of bad grounding or have a dying battery/alt. The amount of power your running should work fine on your car's electricals.

 

[Golitan11]

All right thanks for your nice help.

 

[BrownVanMan 10+ year member]

and at 800 watts your pulling close to 70 amps of current, add in the face your radiator fan could kick on or any other amount of car accessories may kick on your drop is about right.