I need some serious electronic help on the Z

[MistaZ31turbo]

Man somebody please help me. Ok heres the story. I bought a 86 300zx (t) and it didnt have a battery so i couldnt start it. So i got a battery and the windows or none of the lights (headlights, side markers, interior, or taillights) work and the headlights would flip up and down continuly when I tried the headlight switch. So I found some bad fuses and replaced them. So I put the battery in the car and the battery voltage instantly drained. I mean I watched the voltage go from 12.4 volts to 6.5 volt in a matter of seconds. I cant figure out where to even start to look. Please somebody tell me what to do. Any and all help will do. Thanx

[gmac708]

Disconnect everything you can think of, using the fuses. Start putting them back in untill you find out what is causing the drain. I would think that something draining the battery that fast would cause a fire or lots of smoke. Make sure It's not the battery! Check the grounds.

Back to basics.

[evildky]

this is a NEW battery? if it's draining that fast you gotta have an obvious drain ont he system but I'd suspect a bad battery to drain that fast

[MistaZ31turbo]

I did that. I removed all the fuses, fusible links, and relays. One by one I replaced them and nothing happened until got to rear taillight fuse and it instantly drained the battery. So I left that one out and continued. No fuse or relay drained the battery. I then turned on the ignition switch and everything went dead.

[MistaZ31turbo]

Hey would anyone know where ALL the grounds are on the car because I need to check them all. I get spark, have fuel, and it gets air but she still wont start. I ran ECU code and got five of them:

12: Air Flow Meter13: Cylinder Head Temp circuit23: Throttle Valve Switch24: Neutral Safety Switch31: Load SignalWhew......

[evildky]

well, looks liek the codes have a few issues for you to address

the battery grund wire hooks to the firwall and then to the engine/trans

there is a groudn near the drivers head light

and one in the hatch near the passanger tail light

I'm sure there are more but those come to mind