View Full Version : How can a PDF file be added to a post?
As the title reads. Made a PDF file of a wiring diagram, and can't figure how to attach it.
Never mind. In the wiring diagram that I managed to attach, don't ask me how, my question is will this work for the two fresh air fans that I want to install? I've been told in the past to add the switch into the ground leg. Any input would be helpful. Thanks in advance.
Rick,
Do you know the amperage of the fans you plan to use? It may be better to install relays depending on the load. The choke circuit is fused for 10 amps, so if the fans you plan to use exceed that (combined), you'll want to use relays.
Dave
Edit: Something like this ...
https://thefactoryfiveforum.com/attachment.php?attachmentid=137884&d=1605648443
Dave, Thanks for mentioning that. I need to check the draw from the fan motors to see what they're rated at. I guess I can add the relays anyway and avoid the issue. But running the ground lead from the fans through the switch to control them is correct? It's amazing, I may have retained something from all the electrical I've done on the car! Thanks again.
Hey Dave, looking at your diagram closer, I see that you note the fan motor having a direct ground, and the switch also being to ground, is that typical? Maybe I didn't retain all that I thought I had! Also, I guess the 30 and 86 pins just need a jumper between them? I'd have done alright if I just didn't have to do any electrical.
In my diagram, the switch is controlling the relay, not the fans. This is almost identical to how the radiator fan circuit operates.
Here are two examples of typical relay circuits. You could use either for your fans:
https://thefactoryfiveforum.com/attachment.php?attachmentid=137888&d=1605654617
Thanks Dave for helping this old man through more wiring that he'll never completely understand!
Thanks Dave for helping this old man through more wiring that he'll never completely understand!
Most important rule in electrical engineering: Never let the smoke out! When the smoke escapes, bad things happen.
So far, so good! I haven't burned anything up yet, but I'm probably jinxing myself by saying that!
GTBradley
11-17-2020, 07:56 PM
If your fans are like mine the amperage is low. Mine are 130 cfm at 2.5 amps each, so I just used a five amp fuse on each.
Rick,
If your fans are like what Bradley has and only draw 2-3 amps each, then you can simply wire them as you originally thought. The concept of wiring the switch on the negative (ground) side of the circuit is to prevent your switches from carrying any load.
Dave
I just came in from the shop. I checked the fans, and they are 2.5 amp motors with a recommended 4 amp fuse. The choke circuit is on a 10 amp fuse. Do I need to swap that out for a 5 amp fuse, and set up another 5 amp circuit for the other side? Or would I be better off using the relays, as Dave recommended, power both of them from the choke lead, and throw a five amp fuse in-line for each of the motors? I'm sorry, I feel like I'm beating a dead horse, and driving people crazy. I just want to make this as simple as possible.
Must have been typing at the same time. Since the circuit has a 10 amp fuse, should I throw a 5 amp in each side to protect the motors, or am I good to go with the 10 amp?
I just came in from the shop. I checked the fans, and they are 2.5 amp motors with a recommended 4 amp fuse. The choke circuit is on a 10 amp fuse. Do I need to swap that out for a 5 amp fuse, and set up another 5 amp circuit for the other side? Or would I be better off using the relays, as Dave recommended, power both of them from the choke lead, and throw a five amp fuse in-line for each of the motors? I'm sorry, I feel like I'm beating a dead horse, and driving people crazy. I just want to make this as simple as possible.
Rick,
If you don't want to use relays, I'd just swap out the 10 amp fuse for a 7.5 amp at the panel and call it good.
Dave
Thanks Dave, and GT. This will definitely make things simpler. And when I'm involved in wiring, simple is better!
CraigS
11-18-2020, 07:51 AM
Normally I would recommend fusing the fans separately. But since the amps are so low overall, I'd go w/ Papa's recommendation of a 7.5 fuse and move on.