Oil Pressure Switch Wiring - JeepForum.com
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post #1 of 8 Old 04-06-2021, 06:16 PM Thread Starter
Sacto85CJ7
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Oil Pressure Switch Wiring

I saved everything...except the two connectors for these, it seems, and the Howell TBI kit doesn't address these. The pictures I took as I took everything apart don't show this directly. I'll go and search through the two totes of stuff that came off of the Jeep for this project a third time just to be sure.

In case I don't find them, (even if I do) what gets hooked up to these two pieces?

Thanks for the help. It runs and drives now after 3 years and I only have a few details like this to finish before it goes to the smog shop.

Mark
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post #2 of 8 Old 04-06-2021, 06:58 PM
torkman1983
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The oil pressure sender is a purple wire that makes its way through the dash onto the back of the gauge and stays as a purple wire. The two pronged connector is a switch that is usually used to connect power to the electric choke. It basically just allows power to pass through only when Jeep engine is running (has oil pressure). I did not use it and it is not needed with TBI unless you have something in particular that you want to only have 12v when engine running. I just used a switched wire (ignition on) for my Weber choke in that I will not ever have just my ignition on without running engine.
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post #3 of 8 Old 04-07-2021, 07:42 PM
John Strenk
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It also controls the Manifold heater that would be helpful with a TBI conversion as fuel/air is still drawn through the intake manifold.
A MPFI system will not need the heater as only air is passing through the intake manifold.


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post #4 of 8 Old 04-08-2021, 07:40 AM Thread Starter
Sacto85CJ7
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Originally Posted by John Strenk View Post
It also controls the Manifold heater that would be helpful with a TBI conversion as fuel/air is still drawn through the intake manifold.
A MPFI system will not need the heater as only air is passing through the intake manifold.
Thanks, The manifold heater is still in place but that wire disappears into a harness...i'll have to look for the other end.

Mark
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post #5 of 8 Old 04-08-2021, 07:47 AM Thread Starter
Sacto85CJ7
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Quote:
Originally Posted by torkman1983 View Post
The oil pressure sender is a purple wire that makes its way through the dash onto the back of the gauge and stays as a purple wire. The two pronged connector is a switch that is usually used to connect power to the electric choke. It basically just allows power to pass through only when Jeep engine is running (has oil pressure). I did not use it and it is not needed with TBI unless you have something in particular that you want to only have 12v when engine running. I just used a switched wire (ignition on) for my Weber choke in that I will not ever have just my ignition on without running engine.
A quick look and I have no purple wire. The pass. seat is still out so I'll get on my back and have a good look around under the dash. I'll run a new wire if I don't find it tucked away.

Thanks,
Mark
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post #6 of 8 Old 04-08-2021, 08:20 AM
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Garage
Chopped from left and right (mated back together) 1979 CJ wire diagram

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post #7 of 8 Old 04-10-2021, 07:06 PM Thread Starter
Sacto85CJ7
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Quote:
Originally Posted by torkman1983 View Post
The oil pressure sender is a purple wire that makes its way through the dash onto the back of the gauge and stays as a purple wire.
Thanks Torkman1983! I made up a new wire and boom! the gauge moved as soon as I turned the key. When the engine started, straight to 70. It settled in at 40 once the idle dropped.

Mark
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post #8 of 8 Old 04-10-2021, 08:31 PM
John Strenk
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Quote:
Originally Posted by Sacto85CJ7 View Post
Thanks, The manifold heater is still in place but that wire disappears into a harness...i'll have to look for the other end.

Mark
PoolGuyMark
There are 4 wires on the manifold heater relay.

maifoldheatercircuit.png

1 wire is for power.
1 wire goes to the oil pressure switch
1 wire goes to the manifold heater
1 wire goes to a temp switch in the manifold to turn off the heater once the water in the manifold gets warm enough.

The fuse is the fusable link in the Wiring harness from the starter sonlenoid. .
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