As promised, I have a few questions. But first, here are a few particulars about my set up. Iím going to run a Holley Terminator stealth, which has a couple minor differences with the Holley Sniper. The biggest being the ECU is not in the body of the device. Iím also running an MSD 6AL box, most likely on the firewall above the heater box. The MSD blaster coil will either be on the intake manifold or the firewall. I plan to mount the Terminator ECU the engine bay, at the driver side wheel well, thoughts?
I plan to use the same Eaton Bussman that you detailed. In your description you power one buss with a direct battery feed. In order to make sure I select the correct gauge wire for this, do I add up all the potential loads and then run a line from the battery to the buss? How about a fuse or circuit breaker on this line? Any recommendations? How about sizing this breaker?
The other buss you are powering with a 12v source that is provided in both crank and run. What is the benefit of powering this buss that way? The Terminator has trigger wires for the following; fuel pump and two fan triggers. I planned on powering pin 86 via these triggers. I also figured Iíd wire the second buss as a ground to wire all the pin 85ís to. Thoughts?
My fuel tank mounted pump looks to draw 10amps at 12volts. Iím guessing my 170amp alternator is not going to be stressed so I imagine itís output voltage will be better than that, thus reducing my fuel pump amperage further. Would you recommend running 12gauge wire the 20í to the pump? I plan on running the feed wire along with both the fuel supply and return. What protective covering would you suggest I cover this wire with in order to protect it?
You have a lot of questions here, and I will attempt tp unpack and answer them the best that I can. If I miss something, please ask again.
The Terminator system that you are using uses the HP ECU, and yes, it is OK to mount it in the engine back. However, whenever possible, I prefer that it is mounted inside the passenger compartment. If you do mount it in the engine bay, make sure that the ECU connectors are facing down.
The main power bus (the one that feeds the fuses) on the Bussmann panel is rated at 80 amps (steady). If it is mounted close to the battery, I would use a 6 gauge wire to feed it (this is what we used on the Chevelle). If the wire is relatively short, there is no need for a large main fuse.
The other bus on the Bussmann panel is configured to trigger the #86 terminals of the relays (this can't be changed.) in your system, there is a green wire that is for the fuel pump. The Holley instructions state that as long as the fuel pump draw is below 15amps, there is no need for a relay. So, I would run the free fuel pump wire to the fuel pump and not use a relay. Because that run will be fairly long, I would use a 10g wire.
With the fuel pump taken care of, we can discuss fan #1 and Fan #2. Those outputs come off the I/O connector in the main harness. Those are configured to be ground triggers. By having the Bussmann panel provide power to the #86 terminals, the ECU will send the ground signals to the fan relays for activation.
For your installation, I would configure the Bussmann panel as follows:
Pink wire from ignition switch feeds the #86 bus on the Bussmann panel.
3 relays total. I would use 35 amp Packer relays (with diode) for all.
Relay 1 (lets call it ignition): #87 terminal feeds both the red/white wire off the Holley ECU and the small red wire off the MSD. #85 terminals needs to be grounded. 25amp fuse. 12 gauge jumper from fuse to #30 terminal.
Relay 2 (fan 1): #87 terminal feeds the + side of the fan motor (12g). #85 terminal goes to the #1 fan output from the ECU. 30amp fuse. 12 gauge jumper from fuse to #30 terminal.
Relay 2 (fan 2): #87 terminal feeds the + side of the fan motor (12g). #85 terminal goes to the #1 fan output from the ECU. 30amp fuse. 12 gauge jumper from fuse to #30 terminal.
I would ground both fans to the battery, or another reliable ground post. Don't combine the fan grounds into one.
For looming the wires, I like the TechFlex split loom. This is what is used on the Holley harness. For tape, I like the Tesa high heat harness tape, or the 3M cotton friction tape that we used on the Chevelle.
I hope that answers all your questions, if not, please ask again.