Routing other wires with positive battery cable

[Picah]

I am doing the standard battery in the trunk with 2 AWG pos battery cable going to the front via a cutoff switch. Question: I need to run the power and ground from my EFI (Holley Terminator) directly to the battery terminals. I will be running the positive battery in a flexible non-metallic conduit through the tunnel. Can I put the pos and neg wires from the EFI computer into the same conduit or is there some issue caused by their proximity to the pos batter cable? Does the current flowing down the pos battery cable induce a field that will cause a problem? Please go gentle on me, I'm not an EE
Many thanks !!
Ron

[TMartinLVNV]

I have the Holley Sniper. I run the Pos and Neg wires in the same plastic wire loom from the throttle body to the battery with no issues.

[Nigel Allen]

No issue at all for this application. I ran a piece of aluminium flat bar along the route in the tunnel to create tie off points

Have enjoyed following your build.

Cheers, Nigel.

[Picah]

Thanks for the feedback. After doing several things more than once on this build I wanted to be sure that I wasn’t creating a problem with the running of those wires together that would rear it’s ugly head down the road
Stay safe out there
Ron

[Al_C]

I may be way off base here, but I'd like to offer a suggestion. My car is coyote-powered. It, too, requires a hot-at-all-times connection. My battery is in the trunk and I run a cable from the positive terminal to the master cut-off at the front of the trans tunnel (A-frame). My HAAT line to the PCM is off the same terminal on the cut-off that the battery cable is on. So, it is basically unswitched.

Could that work for you?

[Norm B]

I don't know about the Terminator but Holley is adamant that the positive and negative feeds for the Sniper go directly to the battery. There should be no problem with these wires running with the main battery feed. I have mine bundled together to a front battery box without issues. Be very careful with the placement of your other EFI wiring. If the Terminator is anything like the Sniper, it is not happy with RF interference on any one of its sensor lines. I had to move a bunch of wiring in the engine bay and my Holley Hyperspark distributor had to be shielded to prevent it from causing interference with the ECU that is 6" away on the front of the Sniper unit.

Norm

[Fixit]

I don't know about the Terminator but Holley is adamant that the positive and negative feeds for the Sniper go directly to the battery

My guess for this is Holley is depending upon the battery to act as a giant capacitor/filter (as it is) for their electronics, and eliminate tech calls for inadequate power sources.

[Nigel Allen]

The reason is very simple, it's ohm's law. The battery cable has a small resistance, which under running conditions cause negligible voltage drop between the battery and the engine. However when the starter motor is being cranked, hundreds of amps are passed through that battery lead and voltage drop can become an issue to the point of causing electronic components to malfunction. By connecting the FI components directly to battery, the voltage drop along the battery lead is taken out. There is still some reduction in voltage as the battery sags under the load of the starter motor, but a strong battery and good EFI design will cope with that.
Ultimately if you use large cross-sectional area battery cable, combined with electrically solid terminations, then volt drop in your battery leads shouldn't be a problem and the EFI should work fine regardless of where it is connected.

John D. Also hits the nail on the head by saying it is to reduce calls to tech support.

Hope this info helps. Drop me a line if you need anything else. Cheers, Nigel