If a glowplug burns out with the install of a new battery the old battery was probably pretty weak and wasn't giving the GP the amps it should have been getting. Otherwise you have something wrong with the GP fuse, relay or bus wires between GPs or the gorund. You could also have tired glow plugs. I'd make sure you are getting 12 volts to the first plug and that the ground is grounding properly. I belive the series plugs loose 1.5 volts at each plug, so you should get 12v at the plug nearest the firewall, then each plug after that will be 1.5 volts less than the previous one.

Also if you change all your plugs I highly suggest putting in the pencil style plugs. Do a search here on converting from series plugs to parallel plugs and you'll find all you need. It's a simple mod. Put in the large bodied parallel plugs and put a wire connector between each plug and remove the ground. I did this on my 240 and it works great. Much better start ups.

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