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gordon05
Learner
6 Posts
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 Posted - 17 Sep 2006 : 1:56:14 PM
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I am trying to fit a head unit into my vn.
i connect up
perm power (yellow) and switched power (red)
and i cant get anything on the head unit to light up.
so i thought that earth (black) might need to be connected too, so i hook that up still nothing.
im a novice at this but i think with just those 3 things connected it should work right? (although i see an absence of a negative terminal in this senario but nowhere ive read about says anything about that)
so in my thinking it would either be a problem with the power or a problem with the headunit ... so this is what i did.
i took the light bulb from the overhead light inside the car, i hooked each end up to some speaker wire, i ran one end to the negative terminal of my battery and i touched the other end on the following and got the following results.
touched onto perm power - light lit up ... good
touched onto switched power - light did not light up ... bad
i tried this with
a) no ignition
b) reds on
c) engine running
and each time i got the same result ... which tells me that the switched power is not getting any power to it ... am i right??
so i thought that if i connected the perm power from the car (which is working fine) to both perm power and switch power on the head unit, then i would have power 100% of the time without even having to switch the car on ... this did not work.
on the head unit i have ...
perm power (yellow)
switch power (red)
earth (black)
front speakers +/- (various greys x4)
rear speakers +/- (purple and green)
???? - a blue and white cable ... dunno what this is
I also have a male plug that sort of looks like it should be the antenna but i dont think thats relevant atm.
look i hope i havent rambled too much but thats what ive done so far and still nothing.
the only questions i can think of are ...
1)do i need to have the earth (black) connected to have power and illumination to the head unit
2)should i have a negative terminal somewhere?
3)could it be a fuse problem?? ... note that my aircon and heater is also not working.
i cant think of any other questions ... please feel free to suggest anything you think might help.
thanks alot guys.
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Gordon |
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gordon05
Learner
6 Posts
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Posted - 17 Sep 2006 : 4:32:39 PM
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just an update ... i found the fuse box and found that the radio power fuse is out ... replaced it (20 watts) and still not working
i tested the switched power and perm power ... both working fine now.
and i earthed it aswell to the chasis.
my summation is that the head unit is stuffed. |
Gordon |
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mouce
National Driver
1525 Posts
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Posted - 19 Sep 2006 : 7:09:58 PM
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First up, yes you need the black (earth) connected to a metal part of the dash.
I'll keep thinking about things, see what else I can come up with.
Get your hands on another h/u and test it out. If you can get the other h/u to work, then I'd say that your h/u is boned.
Keep in mind that when hooking all this stuff up, the first connection should be the earth, the LAST connection should be the +12VDC cable. |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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Easy
P Plater
23 Posts
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Posted - 19 Sep 2006 : 8:09:06 PM
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I blew 4 fuses before I worked that out 
I found it easier to take the fuse out until all wired up then put it back in.
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mouce
National Driver
1525 Posts
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Posted - 19 Sep 2006 : 9:04:22 PM
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| There's more than just your fuses at stake. Even with the fuse pulled, you should still wire up the earth first. |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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