Audible Noise under dash

[Gordeno]

I have a 1996 gas ford chassis dolphin. I have a random audible alert type sound under my dash, it doesn't happen all the time. sometimes uphill, on the flat, going down hill. I can drive for hours and nothing. then all a sudden it start up again. It last maybe 30/45 second and then gone for maybe several hours.doesn't repeat back to back on same active's. ie driving on the levels. rough road doesn't affect it

It continuous even pitch, I've checked my water, fluids and I know it not the levelers, levelers have a sound of there own. no engine lite, all gauges working properly

Just as a separate information items. I was having a problem with my jack system effecting my speedometer, causing it to bounce and at time would not shift automatically. After spending time and money, I finally found the problem. the grounding checked out ok, but I decided to remove all chassis assemblies and freshly sanded all areas, also added addition ground wires. Finally fixed the problem.

All thoughts will be appreciated.

[BFlinn181]

It might be a buzzer for parking brake on. (I know you've got the brake off, but the alarm could sound from a bad connection.) The other thought might be a buzzer for low oil pressure. Again, probably not real, but a bad connection or switch could trigger it. You might look and see if that year Ford chassis had warning buzzers.