Earth on rear lights

[dukeminor1971]

Hi
My car's driver side rear indicator and brake/side light are both flashing when the indicator is on. When the side or headlights are on just the brake/side light flashes. An initial investigation shows sellotape holding some wires together! Before I start unpicking that can someone tell me how the rear light is connected to earth (is through the light unit screws on to the body?)

[bmcecosse]

There should be black wire connections back to an earth point in the boot floor area.

[dukeminor1971]

Thanks

[mike.perry]

My earth wires are earthed on the bumper anchor bar bolts.
If your wires are held together with sellotape you might want to consider a new loom, short circuits can get very messy