Below is an excerpt from a post on the 3-legged jumper Paul suggested.

Note that the teminal ends have to be flat (male, not female) ends so they will plug into the relay socket
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For a complete diagnostic relay bypass, a 3-legged jumper having flat male terminals is needed—and plugged into the relay harness socket, as follows:

Leg 1 from socket terminal 30 (heavy Red wire, fused battery +12V)
Leg 2 to socket 87-1 (or 87 for K-jet)
• Yellow-Red wire (to K-jet pumps)
• Orange, Brown wires (LH 2.2 AMM etc.)<=== Your '88
• Red-Black wires (LH 2.4 MM etc.)

Leg 3 to socket 87-2 (87b for K-jet)
• Blue wire (K-jet Lambda sytem)
• Yellow-Red (LH 2.2 pumps)<=================Your '88
• Yellow-Red (LH 2.4 pumps, O2 heater)

As with other jumpering schemes, the pumps run immediately. For more than a quick test, a control switch can be wired into the common leg connecting terminal 30 to the other two legs.
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To read the complete post in a new window CLICK HERE.


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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.