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Unread 11-23-2013, 05:56 PM   #1
ethanunc
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Heater wiring

I am adding a new heater in my 76 cj5, I'm wandering what the easiest way to tap into the bulk head is. Also adding a radio any suggestions on which circuit to splice onto? Thanks!

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Unread 11-23-2013, 09:28 PM   #2
thantos858
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Not sure on the heater wiring. Radio I would run a wire direct from the battery with a fuse near the battery to the constant power lead normally red then come off the ignition switch ACC side for power on. As for a ground whatever ground you have under the dash that's good so you don't get feed back from it.
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Unread 11-24-2013, 12:58 AM   #3
MoC
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Not a fan of tapping in to existing circuits...

I would go from battery to a circuit breaker, to a new 5 fuse block. That way you will have 3 more circuits to expand to. Dash grounds are worthless.. Install a small ground bus bar. Run you new circuit grounds directly to it and then one from it to the battery.
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Unread 11-24-2013, 05:42 AM   #4
ethanunc
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Awesome! That's what I'm gonna do. Thanks a lot for all the help guys
Sorry for the silly questions just getting into the jeep thing. But I'm loving
It!
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Unread 11-24-2013, 07:21 AM   #5
Jon In Tucson
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Quote:
Originally Posted by ethanunc View Post
Awesome!
Sorry for the silly questions just getting into the jeep thing. But I'm loving
It!
No such thing as a silly question, this is how we all learn. Lots of prior jeep owners should have asked a few questions before embarking on modifications. But on the other hand, then we current owners wouldn't have very much to complain about, would we? God bless.
Jon In Tucson
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Unread 11-24-2013, 09:04 AM   #6
MoC
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The only other thing I would add is that if you wire it that way your radio will always be hot. If you want it to only work when the key is on I would then recommended splicing in to a 12v switch hot and run it to a relay. It will only power the relay to open / close and not directly feed power to the radio.
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Unread 11-24-2013, 09:15 AM   #7
82JeepCJ7
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I just rewired the heater in my Dad's 72 CJ5. I went and bought one of these..
and power from the battery is controlled though a 20amp relay. Off of that fuse block, I have most of the vehicle electrical systems ran.
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Unread 11-24-2013, 11:42 AM   #8
ethanunc
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Great ! Thanks for all the tips! I was looking at a fuse box like that one.
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Unread 11-24-2013, 04:22 PM   #9
thantos858
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The only other thing I would add is that if you wire it that way your radio will always be hot. If you want it to only work when the key is on I would then recommended splicing in to a 12v switch hot and run it to a relay. It will only power the relay to open / close and not directly feed power to the radio.
You do know most modern radios for cars have a constant power (red), key on (yellow) and ground (black). You want the constant power from the battery to avoid background sounds. The key on power comes from the acc on the ignition switch. The reason its done like this is for the memory on the radio.
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Unread 11-24-2013, 05:28 PM   #10
MoC
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Quote:
Originally Posted by thantos858
You do know most modern radios for cars have a constant power (red), key on (yellow) and ground (black). You want the constant power from the battery to avoid background sounds. The key on power comes from the acc on the ignition switch. The reason its done like this is for the memory on the radio.
Actually I didn't, :-( Not a modern radio guy. So skip the relay then. Pull the constant power from the new fuse block, still with how poor CJ grounds were designed I would run dedicated ground back to a ground bar.
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