Correcting the Wiring Plan and Swapping Relays
At 17:15 in
Our Supercharged Monte Carlo Has Fuel Pressure Problems... We Upgrade the Pump AND Wires!
What happens here
The host realizes a mistake in the wiring plan: the initial MSD relay is ground-activated, while the existing GM ECU provides a 12-volt (power) signal for the fuel pump trigger. This incompatibility means the previously shown nitrous solenoid driver (ground-activated) cannot be used. They decide to switch to an MSD High-Current Solid-State Relay (P/N 75643-HC), which is power-activated and more suitable. This relay features multiple ports for direct connection of positive and negative leads, simplifying installation and ensuring proper function with the GM ECU.
Goal: Adapt the wiring plan for the correct relay type (power activated).
Tools and materials
- Assorted Wires and Connectors — Completing the new electrical connections
- Crimping Tool — Attaching new connectors or terminals
- MSD High-Current Solid-State Relay — The correctly chosen power-activated solid-state relay for the fuel pump
- Wire Cutters — Modifying existing wiring as needed for the new relay
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What they say
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