Product Overview
Preco SWM43C Back-Up Alarm Switch Kit, Unused, Complete with Bracket, Gasket and Mounting Hardware
Condition
New old stock, unused. The photographs show the kit laid out complete: the black molded switch body with its threaded conduit port, the threaded actuating arm with its rubber boot fitted, a steel cover and its flat gasket, a zinc-plated steel mounting bracket with slotted adjustment holes, a black plastic cable gland, a zinc conduit connector with clamp, an O-ring, and loose mounting hardware including machine screws, self-tapping screws, flat washers, internal-tooth lock washers and hex nuts. The switch body arrives with two yellow rubber bands holding the assembly together. The steel cover plate is bare, unplated steel and shows blotchy blue-gray discoloration across its face in the photos. Everything ships in a plain kraft box with the folded Preco installation instruction sheet for Model SWM43C.
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Product Overview
The Preco SWM43C is the switch half of a back-up alarm installation: a mechanically actuated switch that closes the alarm circuit when the machine is put in reverse. It ships as a kit rather than a bare switch, so the mounting bracket, cover, gasket, actuating arm, cable gland, conduit connector and fasteners are all in the box together. The included instruction sheet is titled Installation Instructions, Model SWM43C Switch, and its exploded diagram calls out the cover, gasket, mounting bracket and actuating arm by name, with a second diagram showing the normally closed and normally open positions. Preco Electronics of Boise, Idaho has been building back-up warning equipment since 1947 and is credited with the original patent on the back-up alarm.
Key Features
- Model: Preco SWM43C back-up alarm switch kit
- Manufacturer: Preco Electronics, Boise, Idaho, USA
- Condition: new old stock, unused, supplied in a box
- Switch body: black molded housing with a threaded conduit port and unthreaded corner mounting bosses
- Actuating arm: long threaded rod with rubber boot, already fitted to the switch body in the photos
- Included hardware: steel cover, flat gasket, slotted zinc-plated mounting bracket, black plastic cable gland, zinc conduit connector with clamp, O-ring, machine screws, self-tapping screws, flat washers, internal-tooth lock washers, hex nuts
- Documentation: original Preco installation instruction sheet for Model SWM43C
- Contact positions: the instruction diagram identifies both normally closed and normally open
- Wiring note printed on the sheet: connect the unit to its own separate fused power point
- Electrical ratings and contact current: Not confirmed - verify against Preco documentation before wiring
Applications
- Fleet mechanic replacing a dead back-up alarm switch on a wheel loader and wanting the bracket and gasket in the same box
- Equipment dealer prepping a used dump truck so the reverse alarm sounds before the machine goes back out on a job site
- Municipal shop keeping spare safety switch kits on the shelf ahead of annual vehicle inspections
- Restorer of older yellow iron who wants Preco hardware on a machine that left the factory with it
Frequently Asked Questions
What is actually in the box?
The switch body, the threaded actuating arm with its rubber boot, a steel cover and gasket, a slotted zinc-plated mounting bracket, a black plastic cable gland, a zinc conduit connector with clamp, an O-ring, an assortment of screws, washers, lock washers and nuts, and the Preco instruction sheet. The photographs show the full layout so you can count the pieces against what your installation needs.
Is the switch normally open or normally closed?
The instruction sheet diagram labels both a normally closed and a normally open position, so the switch is drawn with both available. Which one your alarm circuit needs depends on how the original installation was wired. Not confirmed here - check the Preco sheet packed with the kit and your equipment wiring diagram before you land any wires.
Does it come with instructions?
Yes. The folded Preco sheet for Model SWM43C is in the box. It carries the exploded assembly diagram and the operator reminders printed by Preco, including that back-up alarms must be tested each day before the vehicle is operated and that the record of that test belongs in the vehicle maintenance file.
Will this fit my machine and my existing alarm?
Fitment is by part number, not by guess. If your service manual or the old switch calls for a Preco SWM43C, this is that kit. We cannot confirm compatibility with any specific make, model or aftermarket alarm - match the number and the actuating arm travel to what you are replacing.
Can I buy just one, or do I have to take a case?
Buy the count you need. We are deep on these, so one kit for the loader that is down today is a normal order here, and if you are outfitting three trucks you take three. Nobody is forced into a case of ten to fix one machine. Shipping is $8 flat rate and goes free once your order passes $28, so a couple of kits or a kit plus the rest of your parts list crosses that line easily. Orders leave our Idaho warehouse the same or next business day.
Every back-up alarm needs something to tell it the machine is rolling backward, and this is that something, from the Boise outfit that started the beeping in the first place. Bolt it on, give it its own fused feed, and let the switch do the deciding.
