Posted by RAB on June 11, 2008 at 22:56:59 from (205.188.117.74):
In Reply to: Glow Plug Question posted by kopeck on June 11, 2008 at 16:55:37:
They will have a voltage rating. Most systems are parallel these days but many were series wired in earlier years of diesel technology. Landrovers had a large ballast resistor in circuit as well.
Each glow plug should visibly get hot if tried outside the engine and they should, all three, heat evenly as a group. Typically modern ones are 50 - 100 watts so should draw about 4 - 8 amps. The resistance will, of course, rise as they heat up to limit the current.
If they were a dead short the fuse, or the wiring, would have melted by now, so that is clearly NOT the case!!.
If wired the parallel and should be series, they would be toast in short time.
I think your battery or starter or wiring/connections are poor somewhere, or you have the wrong plugs installed. Or the engine is too tight. First do a simple check on the glow plugs and then look for the real problem.
If they draw 8 amps each their resistance when hot will be about 1.5 Ohms.
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