Reverse lights (beep, beep!)

[sunny]

Got Isuzu b/h 1995 (auto). Got problems with reverse lights at back.
When place gear in reverse, there is no “beeping” sound and reverse lights doesn’t light up either. Before I could here “beeping” sound when place gear on reverse.

Fuse seems OK. At odd times "beeping" came back and checked reverse light (worked), but 95% of time there is no beeping = no reverse lights.

Need help to know where I should start to check wire connections.
Thanks in advance.

[tealz]

Check the plugs around the gearbox. One may have a bit of road grime in it.......

[bozza72]

I had the same problem so i just fitted a switch on the dash, it also turns on my rear spot so i can see where im going.