I searched. Most of the results were talking about locating the main relay vs. the fuel pump relay. I've got that part figured out.
My question is: can you remove the "center" pin from a 5-pin (i.e. main) relay and use it as a 4-pin? They have the same pin numbers for the remaining pins if you break off the middle one...
I ask because I have three 5-pins on hand and no 4-pins.
5-pin vs. 4-pin relay
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mooseheadm5
- Posts: 23035
- Joined: Apr 08, 2009
- Location: Charlottesville, VA
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Some 5 pin relays are SPDT (switch between the two pins) and some are DPST (like the main relay- connect 2 pins at the same time.) If you want to use a 5 pin in place of a 4 pin, you shouldn't have to remove the pin. The socket should be the same, but the center pin won't have a contact in it. If the relay diagram shown on the side matches up with the way the 4 pin does (i.e. it connects 87 to 30 when you power it) and the pinout for 85, 86, 87, and 30 are the same on the bottom, you can use it.
Thismooseheadm5 wrote:Some 5 pin relays are SPDT (switch between the two pins) and some are DPST (like the main relay- connect 2 pins at the same time.) If you want to use a 5 pin in place of a 4 pin, you shouldn't have to remove the pin. The socket should be the same, but the center pin won't have a contact in it. If the relay diagram shown on the side matches up with the way the 4 pin does (i.e. it connects 87 to 30 when you power it) and the pinout for 85, 86, 87, and 30 are the same on the bottom, you can use it.
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mooseheadm5
- Posts: 23035
- Joined: Apr 08, 2009
- Location: Charlottesville, VA
- Contact:
The locations of pins 86 and 30 are swapped on the main relay compared to the other relays in and around the fusebox. This means that a main relay in the wrong socket might appear to work, but may drain your battery or overheat a wire, causing an electrical fire.
Lots of stuff in the archives on this.
Here's an example.
Lots of stuff in the archives on this.
Here's an example.