Junkers88

Does the blue wire with a white line in the factory stereo loom go to an optional power antenna? It's just sitting back there in the loom not connected to anything and I want to use it for something. I know it's an off the wall question but thanks.

Oh this is on my 86 SR5 pickup.

dntsdad

Not sure its exact purpose. To test, see if it has voltage when radio turns on and off when either its turned off or the CD/tape is turned on.

Junkers88

Hey thanks. I'm going to grab a test light tomorrow to check it. I'm hoping it'll be enough to power a CB.

abecedarian

I believe it's the remote 'control' wire for amps, power antenna, etc.
If so, it will not supply enough current on it's own to power a CB. It can however trigger a relay to supply power to other equipment... but are you sure you want the CB on only when the radio is on?

Junkers88

I'd actually like to have it come on when the key is turned on but I must confess that I know next to nothing about wiring.

abecedarian

When you get your test light, find the wire to the radio that goes hot when you turn the key on.
make sure the radio is off though so you don't accidentally get that remote wire or some voltage from a speaker wire.
Also, you could tap into the wire to the cigarette lighter.

jason724

Yup.. It should be the blue one that gives you power to the amp and such when the key is in.

space-junk

iTrader: (1)

http://www.installdr.com/Harnesses/Toyota-Wiring.pdf

bigt

grab power from your clock!

abecedarian

I thought about that once, but the extension cord back home was going to be too long.

Junkers88

Thanks cats. I'll grab the test light in the morning and start looking for a wire that comes on with the key turned on.

Junkers88

dntsdad

dont grab power for your clovk...i think that only hot in the ignition position. That will drain your battery faster if not running.

Use the green wire going to your deck. DO NOT try to use that blue wire to power your CB. Bad things will happen.

Use a relay if you want it that way available at any stereo/alarm shop.

Wire 85 to the blue wire on your deck
86 to ground
30 to your cb
85 to a good power source...battery feed is fine.
dont use 87a

abecedarian

so 85 gets wired to the blue wire and a good power source?
Kind of defeats the purpose of a 'switched' source, no?
Since if you wire 85 to the blue wire and a power source all the amps and stuff will be on all the time.

abecedarian

maybe you meant:
30 to a fused power source (battery)
87 to the CB
87a to anything that should be on when the blue wire is not hot
85 to ground
86 to the blue wire (hot when on)

dntsdad

OOOppppssss.....glad you caught that for this guy.

Wire 85 to the blue wire on your deck
86 to ground
30 to your cb
87 to a good power source...battery feed is fine...and yes fused is best. 15 amp should be good

abecedarian

yeah...
85 and 86 are interchangeable, as long as one is ground and the other goes hot to turn the relay on
30 and 87 are interchangeable as well but typically 30 get's the voltage and 87 is the device to be turned on or off.
87a is the opposite of 87- if 87 gets voltage, 87a does not, and if 87 does not get voltage, 87a does, which is why 30 gets connected to the voltage supply (battery)
30 is the supply to 87 and 87a... which one (87 or 87a) gets voltage depends on whether the relay is turned on or off.

dntsdad

Dont get better explanation of how relay operate that this to all of you wire-phobic people out there.
I would just add to anyone reading this later that remember that at rest.....coil not energized.....30 and 87a have continuity, When coil is energized 30 and 87 have continuity. Coil is enegized by putting power to 85 or 86 and grounding the other(85 or 86....if powered 85 ground 86, .....if powered 86, ground 85)

abecedarian

common electrical wiring standards requires:
...30 to be connected to a constant (fused) voltage supply
...85 to be connected to ground.
standards also require 86 to receive voltage in order to turn the relay on.
therefore
... if 86 has no voltage, 87a has voltage and 87 does not
... if 86 has voltage, 87 has voltage and 87a does not

just for the phobic people... you knew there was a reason those relay and switch terminals had numbers on them....