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Well the normal cause would be excessive current in that circuit. As you may know a relay reduces the switching current allowing a larger current to be switched. Therefore you need to check the current draw the easiest way is with a clamp meter as you don't have to disconnect anything as you do with a normal amp meter to connect in series. Then you have to find which component is drawing the excessive current. ;)
 

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i found out the battery was so low when the glow plugs were turned on it was drawing so much power the relay would de-energize very quick.
I would have thought that if it didn't de-energize quickly the light would have been on all the time? Plus if the battery was low it would have a slow cranking speed. ;)
 
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