Relay might work, but wireline which that relay connect might be broken,
so even relay turns on and off, it maybe dont connect electricity to plugs.
You can easily test are plugs working with testing lamp. Take the metal-rail which connects glowplugs out, and just put another wire to + on battery,
and another one to glowplug. If lamp doesnt light, its broken.
PS: dont connect electric on with key.
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