VW Glow Plug Wiring Harness 28971766 – Glow Plug and Fuel Injector Wiring Harness for Volkswagen Golf, Jetta, Passat
VW Glow Plug Wiring Harness 28971766 – Glow Plug and Fuel Injector Wiring Harness for Volkswagen Golf, Jetta, Passat
VW Glow Plug Wiring Harness 28971766 for Volkswagen Golf, Jetta and Passat
This VW glow plug wiring harness is listed by the supplier for the Volkswagen Golf, Jetta and Passat, and the supplier's picture carries the reference 28971766. It is a moulded black harness with four branch connectors, one for each glow plug, and a two-wire lead that ends in metal terminals with orange seals. The supplier's title describes it as a glow plug and fuel injector wiring harness. Easy Life Markets sells it as a single harness for owners and garages sorting out cold-start problems on these diesels.
A glow plug heats the combustion chamber so a diesel engine will fire when it is cold. The plugs get the attention when starting gets difficult, but the harness that feeds them wears out too. It sits on top of the engine, takes heat for years and gets pulled about every time someone works nearby. The connectors lose their grip on the plug tips, the plastic turns hard and cracks, and one or more plugs stop getting power.
In the Box
- 1 x electric plug wiring harness
Glow plugs, a relay, connector housings and fitting instructions are not listed as included.
Specifications
- Product type: Glow plug wiring harness
- Reference shown by the supplier: 28971766
- Listed vehicles: Volkswagen Golf, Jetta and Passat
- Glow plug connectors: Four, as shown in the photos
- Feed lead: Two wires with metal terminals and orange seals, as shown in the photos
- Material: ABS
- Colour: Black
- Brand named by the supplier: SORGHUM
- SKU: CJST275055701AZ
Checking It Against Your Car
The supplier gives three model names and nothing else. There are no years, engine codes or engine sizes in the listing. Glow plugs are only fitted to diesel engines, so this harness is for diesel versions of those models, and the four connectors mean a four-cylinder engine. Beyond that, please confirm the match yourself:
- Read the number on your old harness. Volkswagen part numbers of this kind are normally written in three groups of three digits, so you may find it printed as 028 971 766. Compare it with the reference above.
- Count and compare the connectors. Four straight push-on connectors on one rail, with the same spacing as the plugs in your cylinder head.
- Look at the feed lead. The two terminals on this harness are loose metal pins with seals. They are made to push into a connector housing, so check that yours can be reused.
- Use your VIN. A Volkswagen parts catalogue will give the harness number for your exact engine. Send us the VIN if you would like us to compare it with this listing.
Symptoms That Point to the Harness
- Long cranking and rough running for the first few seconds on a cold morning
- White smoke on start-up that clears as the engine warms
- A flashing glow plug light or a stored glow plug circuit fault code
- New glow plugs fitted, but the fault code returns
- Connectors that feel loose on the plug tips, or cracked insulation along the rail
Before blaming the harness, test each glow plug's resistance and check the relay and fuse. A harness fault usually shows up as a good plug that has no voltage at its tip during the glow cycle.
How to Test the Old Harness
With the engine cold and the harness unplugged from the glow plugs, use a multimeter on its continuity setting. Put one probe on a terminal of the feed lead and the other inside each plug connector in turn. On many of these harnesses the four connectors are fed in two pairs, one pair from each wire, so expect each wire to reach two connectors. A connector that shows no continuity to either wire, or a reading that cuts in and out as you flex the rail, means the harness has failed.
Fitting Notes
- Work on a cold engine and disconnect the battery first.
- Pull each connector straight off its glow plug. Twisting or levering can snap the plug tip.
- Follow the old harness back to its connector and note which wire goes in which position before you release the terminals.
- Push the new terminals into the housing until they lock, with the seals seated.
- Press each connector onto its glow plug until it seats fully, then route the rail the same way as the original, clear of the injection pipes.
- Clear any stored codes and check that the glow plug light behaves normally on the next cold start.
Access differs between engines, and on some the harness runs under other parts. If you are unsure, a diesel specialist can do the job.
Who This Harness Is For
Owners of diesel Golf, Jetta and Passat models who have traced a cold-start fault to the wiring, and independent garages that have matched the reference number.
Common Questions
Is this a genuine Volkswagen part? No. It is an aftermarket harness. The supplier names the brand as SORGHUM, and the 28971766 number is a cross-reference.
Does it also connect the injectors? The supplier's title mentions fuel injector wiring, but the harness in the photos has four glow plug connectors and one two-wire lead. Buy it as a glow plug harness.
Which years does it suit? The supplier does not give years. Match the number on your old harness or use your VIN.
Buy the VW Glow Plug Wiring Harness at Easy Life Markets
You can order the harness on this page. The current price and availability are shown on this page. Please read our return and refund policy before buying.
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