Quote:
|
Originally Posted by Brian Carlton
This is correct. If you have five glow plugs, each with a cold resistance of .5 ohms, each plug will flow 24 amps. 5 plugs in parallel will flow 120 amps. Since the fuse is rated at 80 amps, the plugs must immediately increase in resistance within seconds of the current application to prevent the fuse from melting.
|
This is entirely true, that is why YOU MUST test the glow plugs when the engine is cold otherwise they will give you a higher resistance value.
internal resistance falls as glow plug temp rises which leads to a lower current flow. a new glow plug at engine operating temp has a resistance of about 100ohms