When the car starts to have trouble starting I meter the glow plugs and
usually find at that time one or two glow plugs w/ a very high
resistance. This happens about every 6 months. I have needed to
replace all of the glow plugs at least twice a year. But, again, only
one or two burn out at a time. I am using Beru or Bosch plugs. The
relay was an after market Bosch unit. I did not know they came with
voltage ratings other the 12V?
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