Hi, I am not familiar with the 424 as it was a British build B414D that was shipped to USA as a chassis with engine and transmission. The Delco Remey electrical system, front end, steering assembly and skin was added using USA parts. On the B414 Diesel that were sold in Canada the key switch only enabled the charging system. I looked at the electrical diagram on caseih.com for the 424 and it would appear the key switch has the same function and there are two push button switches on the dash, one for the starter and the other for the glow plugs. The glow plug indicator is on the dash with the holes in it, like an old fashion pepper shaker top. The glow plug indicator is actually a resistor and will glow when the glow plugs are hot enough to start the tractor. Although in warmer climates the indicator does not have to glow for the tractor to start. The glow plugs are wired in series, so if one burns out they all stop working. I would suggest that if one glow plug is bad that all 4 glow plugs be replaced. Take notice of the wiring of the glow plugs before removing them. The over under wiring sequence must be correct to keep the glow plugs in series. If they are wired in-correctly they will burn out the first time they are used.
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