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New Holland Workmaster 35 Hard starting

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haddockfish
Join Date: Nov 2020
Posts: 2 Battle Creek, Michigan
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2020-11-02          199779


My WM35 starts hard when it's cold (below 45 degrees). I pulled the glow plugs, ohmed them out, about 1.1 ohms each, and put 12 volts to each one and they heated up nice. Cleaned the bus bar and checked the voltage on the power wire which was 12 volts, however when the wire was connected to the bus bar I was only seeing about 9.5 volts. I assume the draw from the glow plugs when they're connected accounts for the lower voltage or am I missing something? The battery was new last year.



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New Holland Workmaster 35 Hard starting

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minimac
Join Date: Jun 2013
Posts: 103
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2020-11-03          199782


How long are you letting the Glow plugs heat up before cranking the starter? ....


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New Holland Workmaster 35 Hard starting

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Murf
Join Date: Dec 1999
Posts: 7249 Toronto Area, Ontario, Canada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2020-11-04          199783


This is an old secret method for diagnosing glow plugs, so don't tell anyone.

Take an old school sealed beam headlight bulb. Put a length of wire and an alligator clip to one terminal of the bulb. Put a second wire on the other terminal with a bare end (I solder the end of the wire to make it stiffer and easier to probe with.

In use you put the alligator clip to the negative battery terminal. Now touch the bare wire to the positive terminal and not the brightness of the bulb. Now Touch the bare wire to each of the glow plug wires while disconnected from the glow plug while turning the key on each time. Again, note the brightness each time, all should be consistent with each other and very close to the brightness of the light straight across the battery. Any dim results or no light you have a wiring issue.

Now to test the glow plugs themselves, put the alligator clip to the positive battery terminal and touch the bare lead to each glow plug one after the other (key off for this) and again note the brightness. All should be equal or really close to it.


Best of luck. ....


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