Rail extension garage door openers.
Garage door push button voltage.
The universal remote button kits you speak of are not going to handle the higher voltage associated with the older model opener unless it is powered.
The electrical rep at the home center said the doorbell and garage button are the same.
All available were rated 16v max.
Loosen the two terminal screws on the side of the opener where the bell wire attaches using a screwdriver.
Garage door plug in wireless receiver color sample in white.
Always practice good safety when working on or around your garage door and or your garage door opener.
The voltage to the sensors is usually transformed at the main opener to low voltage probably dc but maybe ac.
Depending on the model most work by connecting two to four wires onto terminals mounting the device on the wall and then plugging the unit into an electrical outlet.
Universal garage door opener led light bulb.
Locate the bell wire that connects the wall switch to the garage door opener.
Usually 12 volts dc so your 13 volt reading is likely correct.
A wall console unit for a garage door opener is not a complicated device so it s fairly simple to troubleshoot when something seems to go wrong.