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View Full Version : My turn signals work but no tail or brake light 78 ford truck


duece02
Oct 5, 2017, 10:15 AM
New turn signal switch light switch new wiring from pigtail on bumber back to lights?

ma0641
Oct 7, 2017, 06:04 AM
Use a VOM to trace the wires. Check voltage through the brake light switch. Make sure fuses are good. Based on what you posted, you are possibly missing a ground wire. That is why tracing a wire is important. It is either no voltage to a switch or no voltage at the lights. If you have 12V at the brake light switch and no brake lights, you either have a bad wire, you said you replaced them, or a bad ground. I doubt all the bulbs are bad.

duece02
Oct 9, 2017, 07:56 AM
Thanks come to find out it waz broken wire on frame an combinationof bad conne ction on fuse block

Stratmando
Oct 10, 2017, 08:02 AM
I believe on that truck Turn and stop are the same filament, odd Turn, works but not brake? Sockets on those would lose ground first(what I usually saw)
Good ma0641 got it.
If I remember, that Tail Light is the same on Wagons, Pickups and Vans?