head unit trouble!!!!

[Chooka]

i've been trying to install a new head unit into my 92 VR4 but i'm having a few problems. the first and most obvious is that the head unit wont work. also now whenever i turn the ignition on the air con is always on auto. i've also now lost the interior lights, the clock and the door lights. i've checked the wiring, fuse etc and cant seem to find the fault. i've seen someone else with the same problem with the air con, and they too had a new soundsystem. i'm guessing this might be a common problem, any ideas? i've searched but cant find any help.

 

[Entaran]

Problem 1: You cut the wrong cable and jumped the permanent off the accessory to the climate control.

Fix 1: Rewire the cable you cut using a joiner to return it to factory, run a seperate permanent directly from the battery terminal (thin blue 10A wire) and cabletie it to your 2 or 4 gauge power line that runs to your fuse box that probably runs to the amp/headunit. Or failing that, run new wires back.

Problem 2: Interior clock and door lights are usually either a bad ground or you blew the fuse labelled STOP and CIG under your dash.

Fix 2: Check them all, replace with 15A instead of 10A and your problems will stop here.

Alternatively if you're in vic, bring it down to my place in Ballarat on a saturday and we can rewire it all here.

 

[Rockabilly]

Your air/con reseting every time you start the car is because you need to
conect the BLUE wire.

 

[bazeng]

the blue must be given 12v is that right?
or is it ground?

i cant remember, but its something like that.. basically u shouldn't chop it from whatever it was connected to..

as for the rest, it sounds like a busted fuse, get a multimetre and measure the voltage across

CONSTANT
ACC

and also check your EARTH

i would disconnect the headunit completely and get the clock / lights working first then wire it up again from there... if it stops working again, u will know what has caused it..

 

[Chooka]

Thanks guys.

I'll start trying to isolate the problem this mornig. Also thanks for the detailed replies and speedy responce, you guys really know your stuff. Great offer from Entaran too, thanks man but it might be a bit to far. I might try and make it up to the Heathcote Drags though, if there's still a spot, been there once before... great fun.

 

[Rockabilly]

Baz from memory I joined it to the power wire. Meaning 2 into 1.
My earth I ground to the frame. Try that Chooka.

 

[Chooka]

All fixed guys!

We'd spliced togeter a few wrong wires, and also blown a fuse. Once we sorted that out it was just a matter of working out what wires went to the aerial... there was about four that went into it. Anyway thanks again for everones help. Now i can drive around playing my S Club Seven CD at full blast... :lol:

 

[Chooka]

HELP!

I've encounted more problems guys, probably more difficult this time. Driving to work on Monday I realised that I had no parking lights or dash lights. (headunit worked mind you). Got it home and it had blown the Tail R fuse

I?ve replace the fuse and tried it again, putting the parkers on and they were fine and then put the head unit on and it blows the fuse but the head unit is still on and working
not having any more fuses, I got out a multimeter and put that over the fuse terminals and trying again, the parkers still worked but then the head unit didn?t as well as noticing that the aerial went up when the circuit was complete (with the multimeter) and down when open

I?m getting very confused here, nothing makes sense as to why the head unit is affecting the parkers circuit. In need of some help :?:

 

[Entaran]

Headunit power should be wired independently. IE Fuse it at the battery and run the permanent seperately. Headunits that power speakers (I'm assuming yours does as it doesn't sound like you have an amp) at any form of volume will overload the factory circuit. The other option is to put in a 30 amp fuse instead of replacing with a 10amp and pray that you don't melt something.