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Old 01-16-2020, 08:21 PM   #1
Zippi
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*How To Install A Relay*

First let me say I know nothing about the electrical portion of a car. I have installed a new set of bucket seats in my 49 and the drivers seat is electric. I have put power to it and it all works fine. I'm told it needs to be connected to a 20 amp relay. I will have one + wire and one - wire coming from my seat. Can someone tell me where these two wires will connect to the relay and where the power will connect. I've looked at wiring diagrams its Greek to me.
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Old 01-16-2020, 10:35 PM   #2
Andy4639
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Thumbs up Re: *How To Install A Relay*

Quote:
Originally Posted by Zippi View Post
First let me say I know nothing about the electrical portion of a car. I have installed a new set of bucket seats in my 49 and the drivers seat is electric. I have put power to it and it all works fine. I'm told it needs to be connected to a 20 amp relay. I will have one + wire and one - wire coming from my seat. Can someone tell me where these two wires will connect to the relay and where the power will connect. I've looked at wiring diagrams its Greek to me.

Ok here you go.
Your relay should be marked with the same numbers as my drawing.

1-You will need a wire straight off the fuse panel are battery that has a good 12 volts on it all the time to plug in to the #30 terminal of the relay with a 25-30 amp fuse in line.
2- Then the + wire you have from the seat will go to terminal #87.
3- The - wire from the seat can go straight to the frame.
4- The relay terminal #85 will need a ground as well. You will need one relay for each seat.
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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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Old 01-16-2020, 11:36 PM   #3
lutronjim
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Re: *How To Install A Relay*

Why is a relay needed? Why not just a fuse?
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Old 01-17-2020, 05:11 AM   #4
Richard
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Re: *How To Install A Relay*

If installed properly the relay will allow power to flow directly from the power source to the device. The switch just activates the relay. In your case ignition turned on will power relay (86). Power to relay from battery (30) should be direct as possible to battery meaning not through switches or other devices. The information provided by the previous post is good. While I disagree a standard 30 amp Bosch relay should be fine for both seats provided adequate wire size is used.
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Old 01-17-2020, 01:22 PM   #5
The Rocknrod
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Re: *How To Install A Relay*

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Originally Posted by lutronjim View Post
Why is a relay needed? Why not just a fuse?
Relays are used in circuits to reduce the current that flows through the primary control switch (like a headlight switch). So your using relatively low current to control the relay (for the headlights), instead of running high amps thru the light switch.
A smaller switch or sensor can be used to turn a much higher capacity relay on and off.
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Old 01-17-2020, 06:21 PM   #6
Zippi
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Re: *How To Install A Relay*

Thanks for the info guys. Only the drivers seat is power so do I still need a 25-30 amp inline fuse? What amp relay do I need? Same size as the inline fuse?
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Last edited by Zippi; 01-17-2020 at 07:22 PM.
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Old 01-17-2020, 08:04 PM   #7
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Re: *How To Install A Relay*

I have a second smaller fuse block with an open spot. I'm not sure what the amp rating is on this block. Can I run a wire from this fuse block to #30 terminal?
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Old 01-17-2020, 11:22 PM   #8
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The relay should be a 30/40 amp and the fuse should be at least 30 amp.
It's like your head lights. You want as much power to get to the seat motor as possible.

No you don't have to put 2 relays in for both seats but if some point 2 people hit the seat switches at the same time then you will know why I suggested 2 relays.
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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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Old 01-18-2020, 08:56 AM   #9
Zippi
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Re: *How To Install A Relay*

Quote:
Originally Posted by Andy4639 View Post
The relay should be a 30/40 amp and the fuse should be at least 30 amp.
It's like your head lights. You want as much power to get to the seat motor as possible.

No you don't have to put 2 relays in for both seats but if some point 2 people hit the seat switches at the same time then you will know why I suggested 2 relays.
Thanks for the help.
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Old 01-18-2020, 10:46 AM   #10
Andy4639
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Thumbs up Re: *How To Install A Relay*

Quote:
Originally Posted by Zippi View Post
Thanks for the help.
Your welcome sir!
__________________
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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Old 01-18-2020, 10:27 PM   #11
lutronjim
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Re: *How To Install A Relay*

If The Rocknrod is answering my question of why a relay, all the cars that I have had didn't have any switch to power the seats - not even ignition. They were, I guess, fused directly from battery. You could open door and move seat.

If the little woman had the seat under the steering wheel and you wanted to get in, you might have trouble reaching the switch or ignition.
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Old 01-18-2020, 10:43 PM   #12
Andy4639
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Talking Re: *How To Install A Relay*

It had to be switched from some place are the seat wouldn't move.
You said your self the switch had to be pushed once you open the door!
__________________
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.
Andy4639 is online now   Reply With Quote
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