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06-26-2016, 12:40 AM
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#1 |
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Registered User
Join Date: Jun 2016
Location: Phoenix AZ
Posts: 429
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Underdash AC relay.
I purchased a truck that has under dash AC and I'm trying to get it to work, but I first have to fix the wiring.
1) doesn't have a fuse before or after the no. 30 terminal. 2) no. 85/86. One has ground the other is not connected. I don't know where this is supposed to come from and how to connect it. If I provide direct power to the 85/86 that isn't grounded, the relay clicks and I get the under dash fan and ac compressor to switch on, but I'm certain that's not how the relay should be connected. Also, since there are two no 30 terminal, can I use one for AC and the other for electric fan or should I run another relay for the fan? Second also, which electric pusher fan do you recommend? |
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06-26-2016, 06:51 AM
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#2 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: Underdash AC relay.
This is a typical relay schematic.
You sure it #30 you have 2 of and not #87? I would run separate relay for your fans.  
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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06-26-2016, 02:59 PM
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#3 |
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Registered User
Join Date: Jun 2016
Location: Phoenix AZ
Posts: 429
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Re: Underdash AC relay.
The second terminal probably is coming off 87 not 30.
I'm going to have to check the wiring again. I could not find power going to the under dash AC other than the one off this relay. Thanks for the help. |
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06-26-2016, 08:25 PM
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#4 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: Underdash AC relay.
The power wire should come from the relay only.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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06-26-2016, 08:44 PM
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#5 |
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Registered User
Join Date: Jun 2016
Location: Phoenix AZ
Posts: 429
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But there is power to the AC or fan, and another power from the switch to turn the relay from open to closed.
Posted via Mobile Device |
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06-26-2016, 09:07 PM
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#6 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: Underdash AC relay.
Yes #30 is suppose to be a fused 12 volts hot then goes through relay and out #87 to the AC. This should be the main hot wire for the AC unit.
#86 should be 12 volts that comes through the AC switch which comes on through relay to energize the #87 which turns the AC unit on.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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