Find a keyed 12v source
Laughing Gas
Joined: Jul 2001
Posts: 1,019
Likes: 3
From: Bismarck, ND
Find a keyed 12v source
I ran into the same problem after adding several accessories to my '85 Bronco. You can find one or two empty fuse spaces on the fuse panel that receive key controlled power, but after you use those up, what do you do? I ran a wire from one of those keyed sources to a relay I purchased and installed under the hood, inside the driver's side fender close to the firewall. (The relay is basically a starter relay / solenoid. It's available from NAPA as part # ST95, will pass 80 amps, is rated for continuous duty, and according to their tech line, only requires around 0.85 amp to trip on or off.) I've got a 10 gauge hot wire running from the battery to and through the relay to an 8-gang ATO (automotive blade type) aftermarket fuse panel I purchased and installed underneath the dash. When I switch the key on, an amp or so runs from my factory panel to the relay, trips it on, and allows battery power to travel to my 8-gang panel. I've got room, now, for accessories like CD-changers, CB's, whatever, and still room to grow into several more circuits, if need be. When the key is switched off, the relay opens, and power is cut to those circuits. This may be worth considering if you're planning to add more accessories down the road...... 
Laughing Gas
Joined: Jul 2001
Posts: 1,019
Likes: 3
From: Bismarck, ND
Find a keyed 12v source
Thanks! It was an idea born out of necessity. I also installed a second 8-gang panel that uses another 10 gauge wire running straight to the battery (both have ring terminals that slip onto the starter solenoid post at the battery positive cable connection). The second panel is hot all the time (and is not switched by a relay), and provides a source of constant 12V power for accessories like extra interior lights (rear cargo area), in-console cell phone power point, etc. Again, as I'm adding things on like electric fans and electric trailer brake controllers, it's nice to have an instant available source for power, and it also saves a lot of time and frustration with the installation. Take care!
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