Troubleshooting Power Isues With the Bulldog Velocity Jack

Updated 07/05/2018 | Published 07/03/2018

Question:

the jack worked fine before installation-upon lifting the trailer off the truck-as soon as there was a load the jack shut off and will not go up-goes down fine. using 2 6-volt batteries but they put corrosion paper behind the flanges to protect the alum. trailer.

asked by: Deb R

Expert Reply:

According to the details you told me, it sounds like you are running the Powered Drive Trailer Jack # BD500199 off of a battery on the trailer.

Does the problem you describe always occur when the jack as at a particular height? If so, the jack tube might be slightly bent. The bend would cause the jack to bind once it reached a certain height. Manually operating the jack would extend or retract the jack past the point where the tube is bent, at which time the motor would be able to move the jack. It is not too difficult to slightly bend the jack tube if it was accidentally left partially extended while the trailer was moving and an obstruction like a speed bump was hit.

Using the two 6 Volt batteries, you will should not have an issue powering the jack if they're wired in series. The jack grounds through the mounting hardware and not a ground wire. Aluminum doesn't make a good ground. If this does not work for you let me know and I will provide more assistance.

expert reply by: Timothy G