Farm Equipment - WD45 diesel wiring diagram question

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WD45 diesel wiring diagram question

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Topic: WD45 diesel wiring diagram question

Posted By: Farrell(Utah)
Subject: WD45 diesel wiring diagram question
Date Posted: 01 Sep 2023 at 10:43pm

I was looking at the wiring on my WD45 diesel and have a question about the L terminal on the voltage regulator. The tractor has a 12 volt generator with a four terminal voltage regulator. Currently, the L terrminal on the voltage regulator is connected to the light switch terminal in the instrument panel. It appears to be providing power for the lights.

Where should the L terminal on my voltage regulator be connected in the instrument panel? Thanks.

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A(1937), 2 G, 2 WD45 diesels, 6 WD45 gas, UC, 2 WD, D17 gas, WF, Farmall 400, D12, Kubota B3030

Replies:

Posted By: steve(ill)
Date Posted: 02 Sep 2023 at 8:42am

that should be correct... The "L" is just another HOT WIRE... It was a common terminal 50 years ago on some systems... normally it came from the ignition switch ... which fed the lights switch.

Here is a SIMILAR drawing... to give you an idea

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Like them all, but love the "B"s.

Posted By: steve(ill)
Date Posted: 02 Sep 2023 at 8:51am

As shown in Figure 3, the regulator has an extra terminal marked "L" which is connected with the lower contact point in the cutout relay. This extra terminal permits current from the generator to be diverted to the load ( head lights) without its passing through the current-voltage regulator.

https://regitar.com/image/file_downloads/Mechanical-Regulator-Service-Bulletin.pdf" rel="nofollow -

Posted By: Les Kerf
Date Posted: 02 Sep 2023 at 10:00pm

steve(ill) wrote:

As shown in Figure 3, the regulator has an extra terminal marked "L" which is connected with the lower contact point in the cutout relay. This extra terminal permits current from the generator to be diverted to the load ( head lights) without its passing through the current-voltage regulator.

https://regitar.com/image/file_downloads/Mechanical-Regulator-Service-Bulletin.pdf" rel="nofollow -

Posted By: ciero2003
Date Posted: 25 Sep 2023 at 9:06am

I have a '51 WD with a 12V generator. Could I use this diagram in wiring a WD properly?

Posted By: steve(ill)
Date Posted: 25 Sep 2023 at 9:18am

yes.... also determine if you want positive or negative ground.... but all the WIRES are the same.

if your regulator has an L terminal, you can run it to the light switch... If it does NOT have an L... just forget that part.

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Like them all, but love the "B"s.

Posted By: ciero2003
Date Posted: 25 Sep 2023 at 9:22am

Thanks so much!

Posted By: steve(ill)
Date Posted: 25 Sep 2023 at 9:26am

from the above DELCO link...

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Like them all, but love the "B"s.