Question about 1996 Volkswagen Jetta

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No current to glow plugs - 1996 Volkswagen Jetta

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The glow plug control unit maybe faulty. Relay might not be switching on. Or could be a broken wire somewhere.

Posted on Oct 10, 2010

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Glow plug setups usually have a relay to handle the high current required to power the glow plugs. This relay could be faulty, preventing operation. It may be possible to swap a relay from another circuit to isolate the problem.

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My 2003 Renault Megane Scenic 1.9dci expression won't start


The funny sound you mentioned must be identified, could it be the starter trying badly to turn. Here the fault of your battery drain is that the glow plugs take a lot of current and it must NOT come ON when the starter motor runs. Hence the fault could be your GLOW plug relay unit with the auto cut off timer that is faulty. If you keep draining the battery to a lower threshold level , there is every possiblity that the battery life will be lowered . I hope the present battery rating is the recommended Amp/hr rating to give the extra run for the morning start. Next area of suspicion is the starter motor itself , it could have a bad commutator or a bush. It will be good to have a clean up and service. Finally check for excessive drain on your battery with a current check in series for the drain current when the switch if off. If the current exceeds the limit disconnect each circuit to confirm. hope this advice helps. good day

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check the wiring harnesses under the valve covers. The heat damages them. Frd has connector kits to service them versus $600 harness. Some dealers know about kits, others do not.
Cycling says reays are working but glow plugs are not getting current. My guess.

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