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Unread 09-22-2014, 06:51 PM   #1
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Default Wiring Relay to Key Switch for Accesories

I'd like to install a couple relays to the key switch for the radio and lights. Since there is no warning buzzer. I like the idea of the key turning off accessories when key is off. I've got a 12v35ah auxiliary battery in the front. The aux battery is also powering a small amp, and LED under mount lights. Can this be done on my 07 cc prec? Also, which/where to find the relays?

I've seen a couple diagrams and pics on the subject just not enough detail for this buggy.
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Unread 09-23-2014, 09:59 AM   #2
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Default Re: Wiring Relay to Key Switch for Accesories

Just use a charger relay or the relay indicated in the picture. You just have to make sure the relay has a 48v coil.

I marked the picture so You know how to connect the relay.

You just need 1 relay to act as the main ON/OFF switch for the AUX battery 12v positive cable. The relay can feed a fuse box and then Your accessories should use individual ON/OFF switches if you want.
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Unread 09-23-2014, 03:26 PM   #3
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Default Re: Wiring Relay to Key Switch for Accesories

Thanks... Easier than I thought. I'll add the switches too.

I'm having to disconnect the headlight blue power cable off of the #4 battery. I think I found it at the wiring harness behind the dash. I'll have to check with a meter to make sure. I plan on wiring the blue headlight wire from the harness to a new 12v fuse block. I'd like to pull the headlight electrical (+) and (-) off of the pack. Where is the headlights getting the ground from off of the Precedent diagram?
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Unread 09-23-2014, 06:22 PM   #4
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Default Re: Wiring Relay to Key Switch for Accesories

The +12v should come off the Blue wire on the 12pin connector behind the dash.

Just trace the wires from the headlight back to the dash and You should find it.

The Negative for the headlight comes off the same 12 pin connector.

I am attaching a higher quality wiring diagram for the 2007 precedent IQ.

If You have tail lights, brake lights, etc... You may be better off attaching your 12v AUX battery negative to same negative (Pack Negative) as Your lights are currently connected.

It will make no difference electrically, and will allow you to use the existing harness.

That Blue wire that comes from the Battery pack can power more than just the headlights, it actually goes into the harness for tail lights, horn, etc...

You definitely need to disconnect that existing Blue wire from the pack and run that to your fuse block or relay.
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Unread 09-23-2014, 07:10 PM   #5
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Default Re: Wiring Relay to Key Switch for Accesories

Yes, I've got taillights, signals, brake lts, and horn. I'll make sure that this is all powered to 12v.

I noticed there is 48v relay behind the dash now. It turns the brake lights off with the key when the key is off. Can I use this relay to wire everything to the fuse block instead of getting a new relay?
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Unread 09-24-2014, 12:28 AM   #6
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Default Re: Wiring Relay to Key Switch for Accesories

Here's a pic of the relay for the light kit now. It turns off the brake lights with the key when the park brake is engaged.

I guess my work is half way done... I can pull the brown wire off and install the 12v Battery wire. Then pull the blue wire to fuse block and install wire to fuse block (+). I'll let you know when I find the power for lights and (-) from the pack.

Thanks!
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Unread 09-24-2014, 12:29 AM   #7
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Default Re: Wiring Relay to Key Switch for Accesories

here's the pic...
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Unread 09-25-2014, 07:45 PM   #8
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Default Re: Wiring Relay to Key Switch for Accesories

I've got this all connected and works in the front. But, my taillights don't have power going to them. No turn signals, brake lights, or parking lights in the rear. Is there a separate power going to the rear tails?
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Unread 09-25-2014, 08:36 PM   #9
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Default Re: Wiring Relay to Key Switch for Accesories

You should have the +12v going to one side of the relay.
The other side of the relay should go to your fuse box.
Both blue and brown wires should go to the fuse box.

Make sure the original Blue spade connector coming from the +48v pack has been disconnected and taped.

Make sure the accessory Negative coming from the pack is connected to the pack -48v.

If that is what You did, it should work.
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Unread 09-25-2014, 08:49 PM   #10
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Default Re: Wiring Relay to Key Switch for Accesories

I didn't put the brown wire from the relay to the fuse panel. I'll connect it and try it. Thx!
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