Dave, I have a BD Pressure lock (12V version) on my truck - it was there when I bought the truck and hasnt worked the whole time Ive had it.

I havent even looked at it yet but do you have any ideas or tips on troubleshooting this thing?

 

I would start by checking the spool valve, it should be mounted up by the air intake manifold with two vacuum lines running to it. Start the truck and push the test button all the way in with a pen, listen to see, or have someone watch if the rod actuates. Try cleaning the spool valve out, take it off, carefully take it apart on a bench and clean it out. If it still will not actuate call here and talk to myself or one of the other tech guys, we will have some other things to try.

 

The tranny doesnt seem to be going into OD - So, with the truck running, if I push the button, it should switch ports? Correct?



Thanks Dave.