12V power source; too many connections? - Team Camaro Tech
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post #1 of 11 (permalink) Old May 1st, 06, 07:47 AM Thread Starter
 
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12V power source; too many connections?

I am finalizing the installation of my electric fan and need a 12v power source. At the fuse box, I am already using the ACC, IGN for other items. In fact, they are being used for a trans brake, line lock and electric fuel pump. How many items can I connect to these sources or is there another option? I do not want to use the BAT source.

Thanks.
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post #2 of 11 (permalink) Old May 1st, 06, 08:19 AM
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Re: 12V power source; too many connections?

When your number of connections start to add up, one way to go is to add a 2nd fuse box, a small 4 circuit kind. If you want it switched, just tap off of the power side of an existing fuse, not the load side. What I mean is that if you take a fuse out, you will still have power on 1 side of the fuse slot ( with key on if switched ). The load side the fuse is the side of fuse slot that goes to the device being powered. This setup does not increase load on the fuse since this added connection does not go through the fuse. And, you are still able to use fuses for the new connections you are adding.
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post #3 of 11 (permalink) Old May 1st, 06, 08:46 AM
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Re: 12V power source; too many connections?

review the tech sections here www.madelectrical.com they have relays to handle the heavy loads you are running.

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post #4 of 11 (permalink) Old May 1st, 06, 11:13 AM
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Re: 12V power source; too many connections?

viperx65, the fuse box was never meant to handle a lot of heavy loads for add ons. The fan, T brake and electric fuel pump should all be wired with their own relays.

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post #5 of 11 (permalink) Old May 2nd, 06, 03:01 PM
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Re: 12V power source; too many connections?

Quote:
Originally Posted by undee72Z
viperx65, the fuse box was never meant to handle a lot of heavy loads for add ons. The fan, T brake and electric fuel pump should all be wired with their own relays.
Exactly. You're asking for trouble running that stuff through the ignition switch, bulkhead, and factory fusebox.
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post #6 of 11 (permalink) Old May 2nd, 06, 03:12 PM
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Re: 12V power source; too many connections?

You want to run the fan off a relay, with (fused) power supplied directly off the horn relay.

Note that if you don't want the fan to run with the ignition off, power the (low amp) relay coil from an ignition switched source





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post #7 of 11 (permalink) Old May 2nd, 06, 05:18 PM Thread Starter
 
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Re: 12V power source; too many connections?

My intentions were never to get 12v power (load) from the fuse box. That load I am getting from the battery. I may have asked my original question incorrectly. Or maybe I am still not understanding.

Let me ask my question another way:

Two examples of switched 12v source requirements:

1) Please go to this link:
http://www.spal-usa.com/fans/automat...ts/FAN-PWM.pdf
I have the "Single Fan - SPAL Sensor - without AC" (page 4). Where would you connect the small gauge orange wire? Is says to connect to the ignition. The only place to do this is at the fuse panel correct? I am already connected to the battery with the large gauge red wire. I only want the fan to be able to run when the car is on.

In case the link does not work go to:
http://www.spal-usa.com
Select fans
Select accessories
Go to the fan controller (scroll down) and click on the tech sheet.


2) Example relay (50102) for my electric fuel pump
http://www.painlesswiring.com/webcat.../1098relay.jpg
Terminal 86, where would you connect for a switched 12v source? The only
place to do this is at the fuse panel correct?

Thanks.
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post #8 of 11 (permalink) Old May 2nd, 06, 05:20 PM
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Re: 12V power source; too many connections?

you can cheat... The yellow wire at the wiper motor.





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post #9 of 11 (permalink) Old May 3rd, 06, 01:17 AM
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Re: 12V power source; too many connections?

Quote:
Originally Posted by viperx65
My intentions were never to get 12v power (load) from the fuse box. That load I am getting from the battery. I may have asked my original question incorrectly. Or maybe I am still not understanding.


Terminal 86, where would you connect for a switched 12v source? The only
place to do this is at the fuse panel correct?

Thanks.
Not the only place, you could.........
Quote:
Originally Posted by JimM
you can cheat... The yellow wire at the wiper motor.
As for how many relays you could connect to the fuse box for a switched 12v source, a whole bunch. Each relay coil only pulls about 1/8 of 1 amp. You don't need to run a new wire to the fuse box for each relay. You can run 1 or 2 wires and branch off to other relays, depending on where you have them mounted. You don't need heavy wiring as the draw would be very low. Even if you had 8 relays, the draw would be only 1 or 2 amps. Hopes this answers you question.

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post #10 of 11 (permalink) Old Nov 18th, 06, 06:26 AM
 
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Re: 12V power source; too many connections?

Quote:
Originally Posted by JimM View Post
you can cheat... The yellow wire at the wiper motor.
Jim,
I am in this same situation and currently have my MSD unit run off the yellow wire on the wiper motor. If I also add my Spall fans to this same yellow wire would that be too much, or should I go into the fuse box since the MSD is already connected to this wire? The Spall fans (dual) have the fuse and relays per the diagram in the link above.
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post #11 of 11 (permalink) Old Nov 18th, 06, 06:30 AM
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Re: 12V power source; too many connections?

As long as you are not attaching any high current loads, you can put a bunch of stuff on that wire.
The switch side of a relay is no problem.
The "on" lead on an msd box is no problem either.





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