Lift Pump Relay Harness for 1992-1994 Trucks and Suburbans.

(((NOTICE))) All international customers (NON USA CUSTOMERS!!!). Please request an invoice by email. Include your postal code and a list of items wanted. Thank you. 

With Wait To Start option click button below to add it to harness.

Product Price: USD 125.00


FOR 1992-1994 trucks/Suburbans. NOTE: See my other listing for 1995 – 2000.

NEW! Now available is the optional Wait To Start WTS priming feature built into the harness. This means the Lift Pump (LP) is turned on while glow plugs are on. It can help with hard starting engines and can lessen the cranking of the starter. Use the top Buy Now button above to add the harness to cart then come back to this page and add 2nd buy now. Make sure you see both items before you pay. Only $20.

This is a Plug & Play Lift Pump (LP) Relay Harness for all 6.5 diesel pick up truck and Suburban applications.

It takes the heavy current load off your stock system and runs full battery voltage to the LP. That allows your LP to opperate at its full potential and greatly reduce the need to change Oil Pressure Sensor (OPS) and or LP.

This kit includes a switch close to the relay to opperate the LP from under the hood. This is great when you have changed the fuel filter and need to bleed the air from it. Makes it a one man job and in just a few seconds.

The factory system on some trucks runs all the current through tiny contacts inside the OPS over a short period of time the OPS burns out because of that. On other trucks the OPS is only used during cranking then the ECM takes over and powers LP via a relay, the problem with that is the wires going to LP are still to small only 18 gauge. That in my opinion is why so many LP’s burn out so fast. So in my opinion any LP on these trucks should be powered via a dedicated relay (even the stock type pumps will benefit).

On DC motors it is important to have full battery voltage because a voltage drop will make the motor perform less effecient. Just a 1 or 2v drop will reduce the maximum PSI a LP can produce.


LP relay harness is made from components made in the USA. The Relay is the weather pack style heavy duty and wires are marine grade. Uses high temp wire loom covering.  Harness is made by hand as ordered and is very high quality.



See this video for WTS Priming option hook up.