Month: July 2025

The alternator is mounted on the right side of the engine using a bracket made by ICT. When I wired the battery, I did some research on the alternator to see what I needed to wire up to get it working. This alternator had the big heavy cable from the battery, and also two smaller connections provided in a plug at the top. These are labeled “F” and “L” on the case. After doing some research, I found Dirty Dingo’s excellent writeup on alternators.

The good news is that the writeup explains everything you would want to know about alternators commonly found on LS engines. The bad news is that this two-wire interface depends on a computer managing it to set the output voltage. It defaults to 13.8 volts (limp-home mode) which will sorta work, but that’s lower than you want. It’s not an easy retrofit to a non-computer setup. I am going to try to get one of the other alternator models that are easier to retrofit. I’ll hook this up in the meantime, but eventually it will need to get replaced.

After putting some fresh gas in the tank, I hit the key and it fired up after some cranking. It ran great:

…for about 15 seconds, and then it started running rough. On restart it was running even worse. I took a quick look at the engine and noticed that fuel was running out of the sides of the carb. The fuel bowls were overflowing.

My first thought was that the needle valves connected to the bowl floats were leaking. After a little more investigation I figured out that they were being overwhelmed by the fuel pump.

I took a closer look at the fuel pump setup, and discovered that there was no regulator. The Edelbrock carb is expecting something around 6psi coming in, and this pump was putting out 15+ psi.

I ordered a regulator and some other parts from Summit, but based on the UPS tracking, the package disappeared after it arrived at one of the UPS hub sites. After a few days of no updates, I contacted Summit. They offered to refund or re-order the missing parts. I asked for a re-order, which they did immediately, and shipped it out via FedEx expedited shipping.

The grille and radiator support was removed to get room to install the new engine. All of the parts came with the truck, they just needed to be reassembled. I had put the grille and radiator support on temporarily, but this time I put all the bolts back in, and made sure everything was aligned properly. The final touch was installing the hood latch. The bumper still needs to be installed.

I found some original used stock-height springs for the front and back of the truck. They are much taller than what is currently installed. Now I have to figure out how to jack the truck up high enough to be able to install them.