One Leg Ballast Resistor or Two
Whether you CAN or MUST use a 2 or 4 pin ballast depends on the ECU you have.
However, if this is a new kit, I would assume it is a 4 pin ECU
A 4 pin ECU CAN use EITHER a 2 or 4 pin ballast
A 5 pin (older) ECU MUST use a 4 terminal ballast.
Unless you have a stash of older ECU's lying around, I would wire it up for 2. You an either cut out the other connections, or just leave them and connect to the 2 pin resistor.
You can NOT tell a 4 from 5 pin ECU by looking, because some of the 4 pin ECUs have 5 physical pins. You can only tell for sure by using an ohmeter from the 5th pin to some of the others.
Wiring difference:
4 pin ECU/ 2 pin ballast
5 pin ECU/ 4 pin ballast
Whether you CAN or MUST use a 2 or 4 pin ballast depends on the ECU you have.
However, if this is a new kit, I would assume it is a 4 pin ECU
A 4 pin ECU CAN use EITHER a 2 or 4 pin ballast
A 5 pin (older) ECU MUST use a 4 terminal ballast.
Unless you have a stash of older ECU's lying around, I would wire it up for 2. You an either cut out the other connections, or just leave them and connect to the 2 pin resistor.
You can NOT tell a 4 from 5 pin ECU by looking, because some of the 4 pin ECUs have 5 physical pins. You can only tell for sure by using an ohmeter from the 5th pin to some of the others.
Wiring difference:
4 pin ECU/ 2 pin ballast
5 pin ECU/ 4 pin ballast
