What is the correct size nut for electrical connections on starter?

FRANK MINOR JR.

MEMBER
1999 PONTIAC GRAND PRIX
3.8L
V6
AUTOMATIC
140,000 MILES

I went to replace my starter and cannot find the original nuts for the two connections. From what I know the S terminal is an 8mm and the Hot is a 13mm. Feel free to correct any errors. What I'm looking for is what type of nut to use for reattached the connectors.

1 Reply

JACOBANDNICKOLAS

MECHANIC
108,170 POSTS

Hi,

Our manuals don't provide this information. However, I was able to do a little research and find the specifications. As far as the 8mm and 13mm, that is likely the hex size. You need to be concerned with the thread pitch and inside diameter.

You will need a fine thread nut, 32 threads per inch, 4.826mm inside diameter. So, you are looking for a #8-32. I believe the original part number is 1979365. That is for the smaller (s) terminal. The larger one that is direct from the battery does require a 13mm socket to remove, but I was unable to find the specifics as far as pitch and thread.

What I suggest is this. Go to a parts store and have them pull a starter motor so you can see the exact nuts. Then, have them match them with the ones in the store they sell.

Let me know.

Joe