2020D Bumble Bee Nest inside cowl. Now problems

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Steamin53
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2020D Bumble Bee Nest inside cowl. Now problems

Postby Steamin53 » Thu Jun 04, 2020 3:45 pm

To my surprise last week after discovering an internally shorted battery on my tractor I found a very busy bumble bee nest inside the cowl behind the instrument panel. They were very active and aggressive. Not seeing another way to be rid of the problem, I chose to discharge an room fogging insecticide bomb through an opening in the bottom of the cowl and bingo, dead nest in the morning.

Prior to discovering the nest I noted an intermittent delay in the alternator and oil pressure warning lights illuminating on the cowl prior. It required several cycles of the key to the run position before they would come on. On starting they seemed to function normally with no issues. Unfortunately after replacing the battery I began to discover multiple problems.

1. No warning lights.
2. No temperature or fuel tank gauges.
3. No functioning of the warning light test button.
4. No horn function.

Some circuits are working;

1. Gauge illumination lights.
2. Turn Signals.
3. Headlights are unknown since the switch is bad and needs replaced.

The tractor will start and run fine but I can't figure out the problem.

When running I measure 12.5 to 12.6 volts at the battery but not having checked it before I'm not sure if that is an appropriate charge from the regulator.

I have checked all the fuses (still original) and none appear to be open. The 5 amp appears to be a slow blow type but appears intact. Please confirm if that is the correct fuse type for the 5 amp application.

I suspect the ignition switch to be the problem but I'm not sure of the switch connectors/circuit identification. I have a repair manual with a wiring diagram but it leaves a lot to be desired.

Does anyone have a wiring diagram that shows the circuits and their component identification of each circuit that they would share with me. Also can anyone confirm what the regulator output voltage should be when measured at the battery at 1500-2000 RPM?

winston
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Re: 2020D Bumble Bee Nest inside cowl. Now problems

Postby winston » Thu Jun 04, 2020 5:15 pm

You have a dynamo, it should put out 13+ ac volts before regulator, after regulator (recitfier) or at battery you should be getting closer to 14 dc volts.
https://www.hoyetractor.com/is52110-inst.jpg

Don't believe I have ever heard of a slow blow fuse being used on one of these old Yanmars, not saying it isn't so. This is the old style fuse and note the note. https://www.hoyetractor.com/PROD/F-15A.htm

Steamin53
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Re: 2020D Bumble Bee Nest inside cowl. Now problems

Postby Steamin53 » Thu Jun 04, 2020 7:10 pm

Correction to my post.

The Horn circuit does work.

Steamin53
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Re: 2020D Bumble Bee Nest inside cowl. Now problems

Postby Steamin53 » Thu Jun 04, 2020 7:37 pm

I'm going to attach an image of the wiring diagram I have. If someone can identify where to check the regulator voltage output I'd be much obliged. Also, any other points that would likely lead to a solution to my problem.

Also the fuses I have on this 2020D are all Bussman style glass tube fuses. I also have an YM1500 that does in fact have the strip type fuses shown in the link from Winston. Tomorrow I'll post a pic of the 5 amp which is a bit unusual in design and looks like a slow blow to me.

Steamin53
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Re: 2020D Bumble Bee Nest inside cowl. Now problems

Postby Steamin53 » Thu Jun 04, 2020 8:01 pm

I've attached the diagram to this post.
IMG_20200604_0001_NEW_001.jpg
IMG_20200604_0001_NEW_001.jpg (138 KiB) Viewed 630 times

winston
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Re: 2020D Bumble Bee Nest inside cowl. Now problems

Postby winston » Thu Jun 04, 2020 8:35 pm

You can check dynamo voltage at two wires coming off it and regulator voltage at battery.

Steamin53
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Re: 2020D Bumble Bee Nest inside cowl. Now problems

Postby Steamin53 » Sun Jun 07, 2020 3:14 pm

Problem solved. Here's the fuse used on my YM2020. It's a 5 amp. The way it is manufactured led me to believe it to be a slow blow but perhaps that's not the case. In any event, despite repeatedly testing it for continuity and it showing good it is in fact bad. The failure appears to be a fracture rather than a typical melt and perhaps it was making intermittent contact. ???

failed 5 amp fuse.JPG
failed 5 amp fuse.JPG (84.59 KiB) Viewed 581 times

winston
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Re: 2020D Bumble Bee Nest inside cowl. Now problems

Postby winston » Sun Jun 07, 2020 5:37 pm

Glad you found the problem, happy tractoring.

Rhody2020D
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Re: 2020D Bumble Bee Nest inside cowl. Now problems

Postby Rhody2020D » Wed Jun 17, 2020 2:33 pm

Hello,

I feel your pain. I also have a 2020D but mice made a huge nest under the instrument panel, fuel tank area and ate a bunch of wiring. Tractor runs but lost lights, gauges etc. Repaired all damaged wires and still not fixed. Will pull cowl next. I think they got at wiring harness.

Also just did knuckle seals. Easier than I thought. Thank you Hoye for all your support over the years!

Cheers
John

Steamin53
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Re: 2020D Bumble Bee Nest inside cowl. Now problems

Postby Steamin53 » Sun Jun 21, 2020 5:10 pm

Thank you to Winston. You're input helped a bunch.


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