Crowder

88 f150 300 5spd

Backup lights won't turn on. New nss. New bulbs. Any ideas?

Just call me Sean

iTrader: (1)

NSS? Neutral safety switch? That has nothing to do with the reverse lights. Switch is on the transmission.

Crowder

Neutral safety switch and reverse switch are the same thing?

Just call me Sean

iTrader: (1)

Not for a 5 speed. It's the clutch switch not a neutral safety switch.

sylver91

The reverse switch is a little red 2 wire plug on the drivers side of the transmission.

Crowder

This has been replaced

Just call me Sean

iTrader: (1)

Better test the circuit.

sylver91

Try this, exact same wiring and colors as the F150 just without the rear window defrost.

Loganwildman

Unplug the connector at the reverse light switch on the transmission, then with the key in the run position use a volt meter to see if you have power on one wire at the connector. If not, follow back up the line to the fuse. If you do have power then plug it back in and follow the wiring harness to the rear of the truck and look for broken wires. Then unplug the connector at the rear of the frame and check for voltage again. Also, check/redo the ground at the rear of the frame. Most electrical problems are ground related in my experience.

Crowder

Ended up being a cut wire in the harness. Thanks