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100ma Standby Current For A Head Unit? Battery Going Flat.

Trav33

By Trav33,
in Car Audio & Electrical

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BCMiller Apprentice

BCMiller

Posted
Posted

I would say thats quite a high current draw, but if it's causing your car to not start on a regular basis I would say your battery is shagged.

I have a JVC HU and only drive my car once or twice a week, and it starts every time.

Chris Rogers Grand Master

Chris Rogers

Posted
Posted

VERY excessive. sounds like there is a short in the output stage of it. at idle you should see 0.005A (50mA) with everything closed.

100mA is enough to flatten a battery overnight.

Trav33 Mentor

Trav33

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Posted
VERY excessive. sounds like there is a short in the output stage of it. at idle you should see 0.005A (50mA) with everything closed.

100mA is enough to flatten a battery overnight.

By 'idle', do you mean with the keys removed from ignition, head unit in 'standby' mode? 0.005A = 5mA (not 50mA), heaps less than 100mA.

Is it possible the installer wired the accessories + battery wires around the other way? Would that cause excessive standby current draw?

Chris Rogers Grand Master

Chris Rogers

Posted
Posted
By 'idle', do you mean with the keys removed from ignition, head unit in 'standby' mode? 0.005A = 5mA (not 50mA), heaps less than 100mA.

Is it possible the installer wired the accessories + battery wires around the other way? Would that cause excessive standby current draw?

my bad I was a decimal point out. but yes at idle with nothing on it should be less than 50mA.

I would pull the fuses on the radio and put a new battery in it and watch it. think you will find that the radio has a short in it. nothing really to do with how it was wired.

if you have a meter with current capability use it and pull fuses until the draw goes away.

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