Need to follow the Holley wiring instructions to the letter!! The battery acts as filter capacitor to help clip any voltage spikes.
EFI Wiring Tips: Proper Ground And Voltage
GENERAL WIRING REFERENCE
An EFI system depends heavily on being supplied a clean and constant voltage source. The grounds of an electrical system are just as important as the power side.
Sniper EFI contains multiple processing devices that require clean power and ground sources. The wiring for them must be installed in such a manner that they are separated from “dirty” power and ground sources.
DO’S
Install the main power and ground directly to the battery. To the POSTS/TERMINALS, not to any other place.
Keep sensor and crank signal (distributor) wiring away from high voltage or “noisy/dirty” components and wiring, especially secondary ignition wiring (plug wires), ignition boxes, water pumps, fans and other associated wiring. It is best that the plug wires not physically contact any EFI wires.
Properly crimp or crimp and solder any wire connections. Apply quality heat shrink over any of these connections.
It is critical that the engine has a proper ground connection from the battery to the chassis, and the battery to the engine.
DON’TS
NEVER run high voltage or “noisy/dirty” wires in parallel (bundle/loom together) with any EFI sensor wiring. If wires need to cross, try to do so at an angle.
Don’t use the electric fan outputs to directly power a fan. They must only trigger a relay.
Don’t use improper crimping tools.
Don’t use things like “t-taps”, etc. Use proper crimpers/solder and heat shrink.
It is never recommended to splice/share signal wires (such as TPS, etc.) between different electronic control units (i.e. “piggyback”).
Don’t connect the PINK switched +12V wire to “dirty” sources, such as the ignition coil, audio systems, or 12V sources connected to HID head lamps.
NEVER start an engine with a battery charger attached
