- Joined
- Jun 2, 2012
- Messages
- 25,363
- Reaction score
- 8,369
- Points
- 113
- Location
- canada
- Vehicle Year
- 1994
- Make / Model
- Ford
- Transmission
- Manual
Are you talking about a 4 post RELAY like this: http://allpointsbus.com/images/parts/ss598.jpg
Or this: https://showtimeih.com/wp-content/uploads/2014/12/ABC139-300x300.jpeg
If so, then only 1 small post is used, the one labeled with "S" , this activates the relay if it gets 12volts
"I" post was not used after 1980 or so
A Starter SOLENOID is on the starter motor, the smaller tube on top of the "motor" part
Looks like this: https://troubleshootmyvehicle.com/images/articles-300-399/310/314/image_T_1.jpg
It also has an "S" post, which also activates this solenoid when it has 12volts
And it can have another smaller post, also unused
Or this: https://showtimeih.com/wp-content/uploads/2014/12/ABC139-300x300.jpeg
If so, then only 1 small post is used, the one labeled with "S" , this activates the relay if it gets 12volts
"I" post was not used after 1980 or so
A Starter SOLENOID is on the starter motor, the smaller tube on top of the "motor" part
Looks like this: https://troubleshootmyvehicle.com/images/articles-300-399/310/314/image_T_1.jpg
It also has an "S" post, which also activates this solenoid when it has 12volts
And it can have another smaller post, also unused