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Old 05-30-2015, 10:16 PM
Bf1055's Avatar
Bf1055 Bf1055 is offline
Join Date: May 17, 2015
Location: CA
Posts: 1
Oil Pressure Wiring Issue

Seems I have some wiring issues. The sending unit has the single wire, which to my understanding should go straight to the gauge on the dash. It doesn't , it loops about two feet of wire and connects to one of the leads on the switch. I've highlighted in blue below:

Where should the two leads from the switch connect?
'89 Grand Wagoneer
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Old 05-31-2015, 10:32 AM
babywag's Avatar
babywag babywag is offline
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Join Date: Jun 08, 2005
Location: Land of froot loops and cukcoo-nuts, CA
Posts: 9,600 has wiring diagrams.

The oil sending unit wire should go inside to oil pressure gauge.

The oil pressure switch wiring is for electric choke power, carb solenoid, and carb vent solenoid, has nothing to do with sending unit(gauge) wiring.
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Old 06-01-2015, 04:38 PM
Heimeken's Avatar
Heimeken Heimeken is offline
304 AMC
Join Date: Nov 29, 2000
Location: El Paso, TX, US
Posts: 1,964
The oil pressure wire should be purple/violet and as stated already goes to the dash.

In my rigs the switch gets 12 volts (switched) from the main harness and sends it out to the choke. Red wire with white line on mine.
'85 Grand Wagoneer "Caterpillar"
401, NV4500, 3/4 ton gear

'79 Cherokee "The Sandgorgon"
One Tons, SOA,T18 on 40's

78 J10 "Imoteb"
J20 running gear and axles
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