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Flat Battery = Weird Electrics

chopobo

By chopobo,
in General Maintenance

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chopobo Veteran

chopobo

Posted
Posted

Hi,

I recently accidentally left my headlights on and drained the battery. Got a jump start took it home and recharged the battery.

After that is when my problems started happening.

The battery would go flat again every few days. Something was draining it. Anyway as a result when I started it the stereo died out.

Pulled the stereo out and with a multimeter found the constant power cable reading very low voltage(like 2-3volts). So no choice we just hooked it all up to the ignition power (which read 12v constant) and used that instead till later when I will rewire another power cable.

Now after that weird incident with the stereo, the climate control and clock settings always reset themselves after each time I start the car. So I reckon I've blown a fuse or something somewhere which stores these settings. Anyone got an idea? I've checked the fuses in the car and engine bay aswell, they all seem to be fine.

Any suggestions to what I might of blown?

cheers

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blind_elk Grand Master

blind_elk

Posted
Posted

The constant 12V is to maintain the "memory" of the A/C, stereo, etc.

If you drained the battery, it will not last much longer. Get a new one. And put the wiring back the way it was.

33driver Rising Star

33driver

Posted
Posted

tell you exactly whats happend, you battery had gone flat, you've recharged it, however its no longer hold a stable charge, so when you crank the car the voltage drops off to maybe 5-10volts which is enough to reset the electrics because the voltage is not bouncing back quick enough when the alternator kicks in.

Like light said, check your battery fluid levels this might lengthen the life of the battery a little bit longer, not sure about the 33 S1's, but the S2 have their battery in the boot so its sealed.

good luck!

lighty01 Collaborator

lighty01

Posted
Posted
tell you exactly whats happend, you battery had gone flat, you've recharged it, however its no longer hold a stable charge, so when you crank the car the voltage drops off to maybe 5-10volts which is enough to reset the electrics because the voltage is not bouncing back quick enough when the alternator kicks in.

Like light said, check your battery fluid levels this might lengthen the life of the battery a little bit longer, not sure about the 33 S1's, but the S2 have their battery in the boot so its sealed.

good luck!

its not sealed. there is a drainage hose for the gases and dribbles. You can still check the fluid levels.

well i still have the original battery i think ;)

i had the same prob. just spent 3 bucks and ive never had a flat battery since

chopobo Veteran

chopobo

Posted
  • Author
Posted

yeh i've topped it up with distilled water

there wasn't much missing

and the battery hasn't gone flat since, well there is enough charge to crank the engine but still having the problem keeping the settings for climate and clock

either way I will buy a new battery i guess

sucks because I bought this battery in april

would of thought batteries can be reused if they go flat

33driver Rising Star

33driver

Posted
Posted
its not sealed. there is a drainage hose for the gases and dribbles. You can still check the fluid levels.

well i still have the original battery i think :wave:

i had the same prob. just spent 3 bucks and ive never had a flat battery since

never looked hard enough i guess lol, big piece of MDF in the way holding a sub lol.

Batteries can be reused once flat but they will never be the same unfortunately, just the nature of the way cells work

lighty01 Collaborator

lighty01

Posted
Posted
yeh i've topped it up with distilled water

there wasn't much missing

and the battery hasn't gone flat since, well there is enough charge to crank the engine but still having the problem keeping the settings for climate and clock

either way I will buy a new battery i guess

sucks because I bought this battery in april

would of thought batteries can be reused if they go flat

if you have enough charge to crank then its not your battery.. your battery should be fine

there is an incorrect wire going to your climate and clock.

check your fuses as well i guess...

im assuming its similiar to a HU, a acc wire and a 12v+ .

if you connect both to the ACC it will work but once your turn off your car it resets everything.

if i were u id make sure i hooked up everything properly and check fuses.

if worse comes to worst take it to a auto sparkie, they will charge for about an hour but it will be fixed

chopobo Veteran

chopobo

Posted
  • Author
Posted

figured it out guys!

it was actually a fuse.

this fuse controls all the electrics in the car and also supplies power to the constant 12v to the headunit

it is located in the fuse box under steering wheel left hand side 7th one from the bottom 10A fuse.

so all is good now, rewired everything and getting 12.4v out of the line.

With 12.4V it is safe to assume the battery is healthy and ok and shouldn't require a swap?

It still starts up no problems every time.

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