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Message: <blockquote data-quote="Tazza" data-source="post: 10094" data-attributes="member: 82">All the plugs should be joined with an aluminum rail. I assume this rail is still there? if so, you should have +12V at each plug even if one is burnt out. Personally i'd remove the plug from number 4 because its easy to get at!. Hool up a hefty piece of wie to it and put it on the battery. See how it glows, if it glows bright red to the tip the others *should* be ok too. If it was me, i would pull them ALL out and check them on the battery then you know 100% that they are ok. If they test out ok, put them back and clean the contacts on the rail and install the rail. Check if that works and if it still plays up hook a wire direct from the glow plug rail to the battery and  see if your starting is better. Glow it for say 15 seconds and start cranking. You can leave the plugs glowing while you start the machine, just don't leave them running too long.If thats not clear just give me a yell. I have tested many plug this way and it works a treat!!! saved me buying new plugs for no reason.</blockquote>