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Posted on Jan 02, 2017
I have same problem either glow plug circuit relay or power signal from main computer faulty. Could also be bad wireing harness they are notorious for this. We put a larger battery (higher cca) in to compinsate for excessive cranking a year later were changing the starter it seems summer comes and we blow it off till its noticable again. If you fix exact problem please let me know what it was if possible. GOOD LUCK and Thanks!
Posted on Jan 06, 2009
SOURCE: NO POWER TO GLOW PLUGS
I have a '98 Jetta diesel that had problems with the glow plug circuit. I ended up replacing the harness and a fuse. All the information I needed to know I found on this web page:
You will have to sign up to post questions, but it's free. I've had many other problems as well and found the experts there very willing to work with you.
Posted on Mar 13, 2009
SOURCE: 1997 VW JETTA DIESEL GLOW PLUGS
You have to replace the defective glow plug. You can test the glow plug without the test light. Just put a wire on the bolted end of the glow plug and connect this to the battery (+) terminal. Then, put a wire around the body of the glow plug and connect this to the battery (-) negative terminal. Hold at this position for a minute or less. Good glow plug will heat up.
As far as the wiring schematics, I will just describe
it. Your ignition switch is connected to the positive
terminal of the battery by way of the fuse in the fuse
box. From the switch it goes to a timing relay before
going to the glow plug terminals. The glow plug body
is screw mounted to the engine block which serves
as the negative terminal. So, as you switch your
ignition, it heats up the glow plug enough to give a
combustion of the atomized fuel in the cylinder piston
of your car causing it to run.
Posted on Nov 21, 2009
most time when glow plug light come on your glow plugs not working.check fuse if fuse is good problem is in glow plug relay.
Posted on Dec 09, 2009
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