The alt is an SI series, as wired it will be fine (reversing the amp gauge is better than getting used to seeing it work backwards) The starter relay is wired with the S small terminal going through the activation coil inside then to ground (mounting bracket), 7 ohms is about right. It is the source of magnetism that moves the plunger and pushes a copper disk against three contacts, connecting them together as long as the S is energized. The big terminal to the battery is the source of electricity to the disk. The other big contact (now connected) is supplying the starter with high current energy. The last contact is smaller, it is connected to the I terminal and that is connected to the ignition coil. It is isolated to prevent the ignition from trying to start the engine, but allow the relay to give bypass voltage to the ignition when starting. Thousands of ohms would be expected, or no conduction. I hope this explains it. Jim
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Today's Featured Article - Tractor Profile: Ford 600 Series - by Staff. The Ford 600 Series tractors bean production in 1954, and continued until 1957. Quite similar to the Ford NAA (Golden Jubilee) in design, it used the same 132 cubic inch Red Tiger engine with 31 horsepower. Several different models were made in the 600 Series, and these numbers were used to denote whether they used a particular transmission, hydraulic system, or PTO. The result was five different model numbers: 620, 630, 640, 650 and 660. These break down as follows:
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