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VW MKV-A5 Golf/Jettas Discussions area for A5/MkV Jetta/Golf (2005/2006 PD and 2009 CR).

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Old November 8th, 2018, 05:57   #1
Veteran Member
Join Date: Jun 2014
Location: Heidelberg, Ontario, Canada
Fuel Economy: 5.6ish L /100km golf.... just under 10L/100km q7
Default glow plug harness - plastic cracked.

I cracked the glow plug harness in a couple spots in my 12yr old 2006 Jetta TDI, when trying to remove it to diagnose a recent glow plug fault code.

It's not a high voltage application, I'm thinking of just giving it a coating of goop or something similiar to weatherproof the cracks...

Any suggestions?

Glow plug fault code is gone - it was a break in a wire from the ECU to the glow plug relay.
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Old November 8th, 2018, 07:24   #2
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Join Date: Jun 2006
Location: Cinti, OH
TDI(s): MK4 & Mk5

If it were me, I'd just leave it as is until I replaced the harness.
00 Jetta TDI GLS Auto Black w/Beige leather, Phatbox
06 Jetta TDI Shadow Blue w/Beige Pkg 2 DSG W/NAV & Phatbox
06 Jetta TDI Blue Graphite w/Grey Pkg 2 DSG W/NAV & Ipod dock
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06 Jetta TDI Black w/Beige Pkg 0 5MT
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Old November 8th, 2018, 10:17   #3
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Join Date: Jul 2010
Location: Safety Harbor, FL
Fuel Economy: 44 typical, 38 minimum, but as high as 50

All of the insulation foam or whatever it is crumbled and fell off of the wires to my glow plugs. The car still runs great, so I am ignoring this condition. I have a new replacement engine wire harness, but am tired of working on cars at present and will only address issues once they become a problem.
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Old November 8th, 2018, 13:48   #4
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Join Date: Jul 2006
Location: Charlotte, NC

It's easy to make a new harness. It cost me around 15 dollars to do it on my '06, and that includes the beer. You'll need bullet connectors, 12 or 14 gauge wire, heat shrink and solder skills. I cut apart the whole harness and wrote down which color wires goes to which glow plug. The whole thing can be performed in a half hour or less. I used western union splices and grease as overkill to make sure there was a solid connection when splicing the harness.
'06 Jetta DSG: GTB1749VC, PD150 injectors, Malone tune, and some other stuff and things
'97 Cummins: It looks stock, does that count?
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