Wiring Gurus need help with vintage air wiring

[72Z/28]

Hi guys

I am a bit confused about wiring the binary safety switch and mounting location of vintage air circuit breaker.

I have got two different wiring instructions of the binary safety switch here from Vintage Air:

http://www.vintageair.com/DownloadsSection/Quick%20Reference%20Wiring%20Diagrams/24677-VUS%20Binary%20Safety%20Switch%20Wiring%20Diagram. pdf

in the above diagram it shows that the binary safety switch is connected to the A/C compressor clutch and the other pin is connected to the A/C thermostat or controller.

The instruction manual on the other hand, shows that the binary safety switch pin is connected to the A/C clutch, and the other pin is connected to the compressor relay.

Could somebody elaborate more on the two different wiring instructions mentioned above.


The other question is where do you guys mount the vintage air circuit breaker if the battery is located in the trunk? Do you guys mount the breaker close to the battery in the trunk or mount it somewhere underneath the dash?

Your input will be highly appreciated

[LSX67]

Use the diagram that you posted, connect blue wire from thermostat to binary switch and then to compressor. Mount the breaker as close to the battery as posable and connect the ground wires to the battery also. I just installed one last week with the battery in the trunk and I had to extend the wires.

[youthpastor]

Also are you running an electric fan? We toss the binary and go with a VA trinary switch for grounding the cooling fan so the fan kicks on with the A/C compressor like a new car.

[Autokraft]

Also are you running an electric fan? We toss the binary and go with a VA trinary switch for grounding the cooling fan so the fan kicks on with the A/C compressor like a new car.

Same here, thats what we do:D

[rocketrod]

Also are you running an electric fan? We toss the binary and go with a VA trinary switch for grounding the cooling fan so the fan kicks on with the A/C compressor like a new car.What he said.

[72Z/28]

Use the diagram that you posted, connect blue wire from thermostat to binary switch and then to compressor. Mount the breaker as close to the battery as posable and connect the ground wires to the battery also. I just installed one last week with the battery in the trunk and I had to extend the wires.

I have two electric spal fans which are controlled via LS1 PCM. One fan kicks on first and after a while the other fan kicks on, not sure at which temperatures they kick on though. both of them run even if the AC is off.

As for the circuit breaker, you mean I should connect the white wire (ground) to the battery directly. Could you please post a photo that shows where you mounted the breaker in the trunk?

[72Z/28]

What he said.

Also are you running an electric fan? We toss the binary and go with a VA trinary switch for grounding the cooling fan so the fan kicks on with the A/C compressor like a new car.

I have got spal fans that are controlled via LS1 PCM

[LSX67]

I have two electric spal fans which are controlled via LS1 PCM. One fan kicks on first and after a while the other fan kicks on, not sure at which temperatures they kick on though. both of them run even if the AC is off.

As for the circuit breaker, you mean I should connect the white wire (ground) to the battery directly. Could you please post a photo that shows where you mounted the breaker in the trunk?

Connect circuit breaker (red wire) to battery positive, connect the white wires to battery negative.

You can use bubble sided tape to mount it on the side of your battery if you don't want to drill holes (there's a lot of options). It's not that important where you mount it, as long as it's close to the battery. Also, if you extend the wires make sure to use the same gauge wire then solder an heat shrink the connections. I hope this helps I am not very good at giving directions but I have installed a lot of these units.

[72Z/28]

Connect circuit breaker (red wire) to battery positive, connect the white wires to battery negative.

You can use bubble sided tape to mount it on the side of your battery if you don't want to drill holes (there's a lot of options). It's not that important where you mount it, as long as it's close to the battery. Also, if you extend the wires make sure to use the same gauge wire then solder an heat shrink the connections. I hope this helps I am not very good at giving directions but I have installed a lot of these units.

Thanks a lot man you explained it well, really appreciate it. I did go through the wiring on both fans, and I found out that there were two fan wires from the PCM connected to 40/30A relays and two spal fans are connected to two 40/30A relays. In other words I have got 4 relays for the fans, all of which are connected to a 70AMP MAXI FUSE.

Is it OK to have a common MAXI FUSE for the 4 fan relays? I am not a wiring guy, so not sure about this set up.:_paranoid

[LSX67]

Thanks a lot man you explained it well, really appreciate it. I did go through the wiring on both fans, and I found out that there were two fan wires from the PCM connected to 40/30A relays and two spal fans are connected to two 40/30A relays. In other words I have got 4 relays for the fans, all of which are connected to a 70AMP MAXI FUSE.

Is it OK to have a common MAXI FUSE for the 4 fan relays? I am not a wiring guy, so not sure about this set up.:_paranoid

I am not sure why you have 4 fan relays? A Spal wiring harness has 2 fused relays that connect to a battery source ( yellow wire one for each fan). 2 orange wires that connect to 12v ignition, 2 grey wires that connect to PCM or temp sender. You can have several relays on one maxi fuse because the relay carries the load. (www.spalusa.com) detailed wiring diagrams on web site, check it out.

[72Z/28]

I am not sure why you have 4 fan relays? A Spal wiring harness has 2 fused relays that connect to a battery source ( yellow wire one for each fan). 2 orange wires that connect to 12v ignition, 2 grey wires that connect to PCM or temp sender. You can have several relays on one maxi fuse because the relay carries the load. (www.spalusa.com) detailed wiring diagrams on web site, check it out.

The fans came mounted on the radiator which I believe it is Ron Davis radiator. I bought the car with this setup and frankly speaking I am not sure how the idiot who wired the car did the wiring of the fans because the relays and fan wires are not the ones supplied by Spal Fans.

Thanks for the input on the fan wiring though, and I am going to go the wiring schematic of Spal Fans once again