head unit current draw with external amp

[bobo244 10+ year member]

I have a dual battery setup with my head unit running off the main battery and the 4 channel and sub amp on the optima with an isolator.

Since I am using an external amp to power the speakers how much current does the head unit draw off the main battery? I like to listen to music loud in parking lots and stuff with my car off and subs off, but I am worried that my head unit will draw too much from the front battery.

Is it really necessary to run the power wire from the head unit to the rear battery??

The head unit is pioner AVH-p6500dvd. I am guessing that the current draw will be signifigantly less the the TV closed.

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[bobo244 10+ year member]

come on..... no one can help me out??

 

[bobo244 10+ year member]

If you're not using the internal amplifier, a head unit will draw very little current (maybe a few amperes) ... If it's an LCD screen, I'd guess less than 10 amperes total for the HU + TV ...

so will amps kill the optima before the HU kills my stock battery (650 CCA i think dont know about reserve cap) ???