Does anyone know why some models have this round starter relay instead? Is there a difference between the one below and the first one I posted that is more of a square shape?
This round one is the relay my truck came with, but the large terminals are just too close together. After nearly jumping out of my skin for about the third time this year because I accidentally bridged the two terminals and the starter began spinning, I would like to switch to the other style shown in my first picture. Will there be a problem doing that?
The photo in post 1 is the older style, better built I think.
I saw a you tube video of the inside of the newer style relay, I understand why they dont last long.
The "S" post goes toward the battery, "I" toward the starter. But it is just a relay and doesnt care about the direction of the curent flow thur the 2 big terminals.
1986 F150 XLT Lariat 4x4 300 C6, 9 inch 3:50, 235-15 tires, sway bars, DS2 w/ GM 4 pin and no computer; 3G ALT swap, PMGR starter; 120,000 miles, 2nd owner
Watch out for some of the newer models. At some point they did away with the "I" terminal. I think it was an 86 Ranger I was working on had that newer style.
Does anything even connect to the "I" terminal on the 1980 - 1986 trucks? Nothing does on my truck. I know the 1979 and under trucks do, and I think that is why all of the replacement starter relays have both an "S" and an "I" terminal.
S is the signal terminal to trigger it and I is the ignition terminal to provide 12v to the coil for starting, at least thats how my 68 is wired with the old points system.
Keep in mind the I terminal will not trigger the relay and if installed backwards the I terminal will always be hot.
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84 F-250 6.9 with a boost from Hypermax.
87 F-150 5.0 The winter truck
68 F-250 CamperSpecial 390ci/NP435 Getting a Diesel!
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