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Correcting the Wiring Plan and Swapping Relays

17:15
43:16
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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

What they say

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to doing the wiring. And I just remembered that when I used one of these before, it's on the bump button in the Escalade. That's That's why I am familiar with this. I just had that realization last night and figured I would share. Logan is going to wire this all by herself without my help. I helped a little bit on the fans, but I'm going to help less this time. There's It's really simple. What did you do on the fans? I helped you um You just labeled it and you had to help me crimp it. Also, I think we found a solution to our pump depth issue. You think? I think. Haven't tried it yet, but I think this is about as good as it's going to get. We got very lucky in that Rob has all kinds of CNC stuff. That's what he does for a living. So I went over there and said, "You have like a piece of aluminum like/ inch thick I can make a spacer with." Cuz in my mind, I thought we were just going to, you know, have a square, drill some holes in it, whole saw the middle out, and just bolt it on there. And he's like, I could make this in the CNC faster than you could do it by hand. I'll just draw it out on CAD real quick. So like, okay. We left to get some longer bolts. And we came back. He had it all ready to go and uh put the GoPro in there so you could see it happen which you watch right Yeah. that pretty cool, huh? Now we have this perfectly perfect spacer, which should be perfect. Did I say that already? I don't know. And what that's going to do is get the pump sock farther from the bottom of the tank so it doesn't starve out. And apparently if you go on the tanks website now it says uh for pumps bigger than 255 L per hour don't use this tank cuz it doesn't fit. Wow. That information would have been great to have in 2017 when I bought that and they sold all that to me. But I guess everybody learns lessons the hard way. At least they have a solution now. But maybe we have found one for existing guys so you won't have to change your entire tank. I don't know. We will see. Well, like after you crimp it, you like pull on it to make sure that you actually did a good job. So, you know, it's not going to like have a problem later. That's not how you said it to me, though. Well, cuz I was being goofy cuz it was just you. Yeah, be goofy. No, goofy is fun. Got to pull on it nice and hard. You can hold it with the crimper before you squeeze it and like make sure it's in there all the way because some people will mess up the butt connector by squeezing it when it's not in there…

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