The Holley four-channel coil driver module is a "dumb coil" driver that plugs into the main harness, used when running factory-style ignition coils that require external timing control. It houses one 4-channel driver in a potted, black enclosure suited for engine bay mounting.
Specifications:
- Function: Four-channel dumb coil driver, used with two-wire ignition coils
- Channels: Four (one 4-channel driver)
- Construction: Potted design, installs in the engine compartment
- Color: Black
- Part Number: 554-123
FAQ
What is this module used for?
It drives a two-wire "dumb" ignition coil that plugs into the main harness, needed when running factory-style coils.
How many channels does it drive?
It's a four-channel driver, containing one 4-channel driver module.
Can it be mounted in the engine bay?
Yes, its potted design allows installation in the engine compartment.
What color is the housing?
Black.

