I'm installing (being as I am an amateur radio operator) a radio 'sled' in the boot to allow me to have communications (yes, we still do that...) in my cars. I'm also installing an XM radio receiver at the same time, so, this will all come together somehow on one platform (yes, the power leads from the battery are fused on both sides, as is the trigger lead...):





But, I want to have the radio brick follow the ignition switch, in other words, when the car turns off, I also turn the radio off...to prevent draining the battery.

I usually do this using a 12V relay that controls the +/- power leads to the radio, but key the relay using a switched 12V signal from the fuse block. The relay draws minimal power (in the 10s of milliamp range), so, it's not even noticed in most electrical systems (unless you're looking for it...).

If anyone has a wiring chart handy...are there any circuits (I figure I'll ask before digging out the simpson 260 and digging around myself) in the boot fuse block that you know are switched? I know that #25 (?) feeding the ciggy lighter is switched, but, would prefer to find another circuit that would be more appropriate.

Thoughts?

Thanks.

 

There is 12V in the boot, it is the infamous wire with connector next to the battery (search for something like "what is this connector for?").
It is a 3-way connector, one is earth, one is constant power, one is switched power through a relay in the boot fuse-box (relay probably not installed).
I used the same power supply for an additional power outlet for things like the pick-nick cooler.
I hope that's the answer to your question.

 

Let's see if this attachment, the 2000 Electrical guide, comes thru

 

Made through fine; thanks.

From bashing together two diagrams:



What I'm thinking is that the missing (in mine) brown relay in the trunk in the red highlighted location should be replaced (I have a box of spare Official Jaguar Brown Relays) and then the Blue/Yellow (U/Y) wire in the accessory connector should then present a +12v signal when the ignition is on, and open when the ignition is switched off. Will try tomorrow.

(wondering where the passenger compartment accessory connector is located....hmmmm....)

Thanks again for the electrical guide!

 

Update...popped in a relay...blue/yellow is the switched power, confirmed with my VOM.

Thanks for the guidance. That did the trick. Now, to finish the rest of the wiring for the sled and get the radios mounted properly.

 

[QUOTE=bdboyle;1345711]Made through fine; thanks.

From bashing together two diagrams:



What I'm thinking is that the missing (in mine) brown relay in the trunk in the red highlighted location should be replaced (I have a box of spare Official Jaguar Brown Relays) and then the Blue/Yellow (U/Y) wire in the accessory connector should then present a +12v signal when the ignition is on, and open when the ignition is switched off. Will try tomorrow.

(wondering where the passenger compartment accessory connector is located....hmmmm....)

Thanks again for the electrical guide![/QUOTE
The cabin connector is located behind the righ kick panel

 

Found it! Thanks. Made my day! Love it when a plan comes together!

 

I've been working on this today and I found that unused connector however mine does not supply any power. I bought a new relay and put it in and it doesn't help. Is there anything I'm forgetting? Could the fuse for the connector be blown? Which fuse powers this thing?

In any case, is there another 12v switched line in the trunk I could use? Much thanks.


EDIT: nevermind, looks like the line to ground isn't a good one. I grounded it directly to the frame of the car and it seems to be behaving now.