On a engine with the loop glow plugs, and they are wired serial, is there more than one way that they can fail?

Someone posted a very helpful, how to, that describes the failure of the loop glow plug, in a wired in serial engine, and it shows the loop being burnt with a whole in it.

I am trying to trouble shoot, and would like to be clear if there are other ways that the loop glow plugs can fail.

i am believe that the 80amp strip fuse can fail as well as the GP relay. i think with thoes two and the actual loop being broken thoes are the three ways the system can fail.

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-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto

The loop style GPs use a 50 amp fuse.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

Hi and Thanks,

I am wondering if one failure mode would be that the loop glow plugs could still pass current, but not glow. (I know if there were too few amps at the first plug in the series ... that it would, but assuming enough amps at the first plug)

If there was only one failure mode, i.e. a broken loop, then testing for current one plug after another with a test lamp would identify the failed plug.