Easy
15-30 minutes
This is a Genuine Manufacturer Sourced replacement part used on a variety of Black and Decker Trimmers/Edgers. This item is Sold Individually. Switches are a commonly replaced part in power tools, handling on/off operations. Because switches use mechanical internals, they will degrade and wear out over time, eventually requiring replacement.
On-off Switch 383994-00
OEM part for: DeWALT, Black and Decker
Part Number: 383994-00
$4.99
In Stock
Ships within 1 business day 
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Compatibility
This On-off Switch will fit the following 199 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Black and Decker
Show More Compatible ModelsThis item works with the following types of products:
- Grass Trimmer Parts
- Trimmer Parts
- Edger Parts
- Blower Parts
- Vacuum Parts
- Shear Parts
- Hedge Trimmer Parts
Customer Part Reviews ?
Average Rating (out of 5):
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Perfect replacement
Product arrived much quicker than expected. It was a perfect OEM replacement which installed easily
Guest -
September 26, 2023
Verified Purchase
Kept an old, unique string trimmer from the junk yard
Trimmer works like new again. Thanks
Ikey -
April 29, 2023
Verified Purchase
What I needed, unavailable locally
While I have not had a chance to reassemble the unit complete with the new switch, the part you sent appears to be exactly what I needed.
Guest -
April 25, 2023
Verified Purchase
Longer than expected
Took longer to receive item than advertised probably due to US postal service these days. Switch fixed the problem. Thanks
Guest -
March 6, 2023
Verified Purchase
OEM Quality Replacement Switch
Great price, speedy delivery. Switch works perfectly. I'll be back!
Guest -
November 14, 2022
Verified Purchase
easy to find and works great.
fit perfectly and arrived as promised ,
Guest -
September 7, 2022
Verified Purchase
Replacement switch for my "weed eater".
The switch was purchased on line, and recieved promptly in great condition because of the package system. The switch was easy to replace and straight forward. I enjoy this particular B/D product and plan on keeping it in working condition as long as possible...
Guest -
July 11, 2022
Verified Purchase
part was a perfect match and repair was easy - much less expensive than buying a new hedge trimmer. Part was shipped and arrived in less than a week.
part was a perfect match, repair was easy and much less expensive than buying a new hedge trimmer. The part was shipped and arrived in less than a week. Great service!
Guest -
June 9, 2022
Verified Purchase
Perfect replacement switch to regain use of my weed wacker
Part was the exact replacement switch. Delivery was fast, allowing me to leave the wacker on the work bench with the case opened for the switch to be installed. New life to a tool with plenty of service left in it. Price beats the cost of a new weed wacker!
Greg -
May 23, 2022
Verified Purchase
Cheap and easy repair
Easiest part I've ever replaced, inexpensive and fast delivery!
william -
October 26, 2021
Verified Purchase
Questions & Answers ?
Our customer Service team is at the ready daily to answer your part and product questions.
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Switch was bad, would turn on, but not off, the spring loaded mechanism inside the switch worn out.
Erik - August 6, 2017
👍 3 of 4 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Unscrewed the handle assembly, unplugged the 2 wires that were attached, removed the switch, and reversed operation to install.
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On/off trigger switch fail
charles - October 10, 2018
👍 3 of 5 people found this instruction helpful
Tool Type
Hedge Trimmer
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Pliers
Parts Used
Open up handle
Remove old switch
Repair connection to new switch
Test switch
Re-assemble
Careful when removing, & connecting wires
Remove old switch
Repair connection to new switch
Test switch
Re-assemble
Careful when removing, & connecting wires
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On-off switch failed
Charles - September 14, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Hedge Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Pliers
Parts Used
Removed the old switch and installed the new one.
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Broken ON/OFF switch
Peter - May 8, 2016
👍 2 of 3 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, None
Parts Used
Replacement switch fit like a charm; trimmer is useful once again. Hardest part was finding Torx screwdriver to remove screws. Slid wires off old switch and inserted on new switch, then re-installed screws.
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Trimmer switch would no longer work.
terri - March 19, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver
Parts Used
I removed the screws attaching the handle and removed one wire at a time from the old switch to the new one. Then put the handle back together.
I just can not believe how fast we got this part. Second time we ordered from this company and they have great service and the right parts for the job. It was easy to do....Thanks a lot.
Terri
I just can not believe how fast we got this part. Second time we ordered from this company and they have great service and the right parts for the job. It was easy to do....Thanks a lot.
Terri
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Weed trimmer erratic power due to loose switch contacts
Nathan - March 12, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver
Parts Used
This was a simple repair. I just had to use a Torx driver to disassemble the trigger housing of the weedwacker (Black and Decker ST4000,) pull the wire terminals off the faulty switch, replace them on the new switch, install and close up the housing. Easy, peasy.
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Switch replacement & lever replacement on line spool
Thomas - January 3, 2016
👍 3 of 5 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Needle nose pliers
Parts Used
Parts arrived in the mail - accuracy of the order was spot on!
Downloaded the parts diagram for the trimmer....on the internet
Removed screws from handle assembly. Took one terminal at a time from the old switch and put it in the same place on the new switch. Put housing back together. I then pulled the defective lever out of the spool holder, then pressed the new one back in.
Both items installed without any problems and the trimmer worked as good as new - saving me the expense of replacing it with a new trimmer.
Much appreciation and thanks!!
Downloaded the parts diagram for the trimmer....on the internet
Removed screws from handle assembly. Took one terminal at a time from the old switch and put it in the same place on the new switch. Put housing back together. I then pulled the defective lever out of the spool holder, then pressed the new one back in.
Both items installed without any problems and the trimmer worked as good as new - saving me the expense of replacing it with a new trimmer.
Much appreciation and thanks!!
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On /off switch developed intermittent power from several years use
david - October 9, 2018
Tool Type
Grass Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Socket set
Parts Used
1. Removed screws from handle assembly covering switch.
2. Removed old switch and disconnected two wires from switch being sure to memorize polarity.
3. Attached wires to new switch and placed in handle.
4. Replaced handle cover.
2. Removed old switch and disconnected two wires from switch being sure to memorize polarity.
3. Attached wires to new switch and placed in handle.
4. Replaced handle cover.
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Burnt switch
Kemmy - September 4, 2018
Tool Type
Hedge Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, None
Parts Used
Removed screws to expose switch and replaced super easy saved me form having to buy a new hedge trimmer
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On off switch stop working
Harold - August 31, 2018
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver
Parts Used
Had to remove cover off on off switch, replace switch, put cover back on. Easy to replace
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Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
