Having problems with your 1997 Volkswagen Jetta ?

1997 VW JETTA DIESEL GLOW PLUGS

\015 NEED VW JETTA DIESEL WIRING SCHEMATIC. GLOW PLUG WON T STAY ON LONG ENOUGH TO WARM. ITS SHUTS OFF IN A SECOND AFTER TURNING THE IGNITION KEY ON . BUT I TOOK A TEST LIGHT TO THE CONNECTION ON THE GLOW PLUG. THAT NEVER COME ON FOR THE GLOW PLUG TO WARM UP. I ALSO TESTED THE GLOW PLUG AND FOUND TWO IS NOT WORKING. I TESTED THE GLOW WITH A 12 VOLT TEST LIGHT. ONE END IS CONNECT TO 12 V POSITIVE AND THEN PROP THE OTHER END TO EACH GLOW PLUG . FOUND ONLY TWO GLOW PUG LIGHT UP. CAN YOU HELP?\015 Posted / edited by AnonymousUser on : 20-11-2017

Answers :

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.
The glow plug relay is responsible for the duration of glow plugs, this needs to be the starting point. You should get a 12v out for so many seconds when ignition is switched on.
\015\012I have taken the cover off relays in the past, cleaned up the internals, sprayed with circuit cleaner and got plenty more years out of them, worth a try.
Repair Help & Product Troubleshooting for 1997 Volkswagen Jetta

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