i have a 70 ford f100 302 3 speed. i have tale light turn but no brake lights and e flaser will not work with out turn not on.

 

The brake light and turn signal share the same filament in the bulb. The tail light uses the other filament.

You are gonna have to trouble shoot the issue. A circuit tester should have it working in about an hour or less. Remove the tail light bulb and start testing from there headed towards the cab.



John

 

what will make flashers not with out the turn signal being on.

 

Flashers can fail, it is a little can looking device a little bigger around that a quarter and about 1.25 in long. Bulbs can burn out, it is hard to say until you trouble shoot it.

Burned out bulbs will stop a flasher from flashing too. With the ign. switch on start with the brake lights get something weighted to hold the pedal down. Once you have working brake lights start attacking the flasher issue. They are pretty cheap, grab a new heavy duty one and replace it.

Bill can help with part numbers.


John

 

TC70, also check your fuses. These trucks use the same fuse for both stop lights and emergency flashers. A fuse could be blown or it could have corrosion in it's holder. The emergency flashers and turn signals have seperate flashers.

 

Hey John, here's a little troubleshooting trick that works on most older Fords. When everything is working as it should if you turn on the flashers then step on the brake pedal the flashers will stop working. The dash indicator lights will be on steady. If it doesn't act like this something is wrong. I like to get the flashers fixed first as it often saves the extra work of checking the same components twice.

Industry standard part number for a 2 terminal flasher in these trucks is 552. It's likely been superceeded but a reasonably good parts person can interchange it pretty quick.

 

Bulbs with corroded contacts and/or hairline cracks in the base can cause some very confusing issues like shorting the running light circuit to the turn signal/brake light circuit and some other symptoms. 1157 bulbs are cheap, so if I have an unusual problem, I typically replace both rear bulbs and then both fronts or at least remove all 4 before using my test light. YMMV.
Gene

 

Thanks Clay, I'm sure there are plenty of great tips that I don't use.



John

 

emergency flashers will not work with out the turn signals being on.

 

tc70, you drive a ford you don't need working emergency flashers!lol!! my 67 doner truck was the same way. i could never figure it out, and all my lights worked under normal conditions (turn,park and brake).

 

but my brake will not work.

 

oh i forgot that part! have you checked the switch at your brake pedal?

 

Check the flasher. These trucks used seperate flashers for turn signals and emergency flashers. Most that I've seen had the emergency flasher mounted in a clip on the steering column brace. Look under ther dash on the right ( passenger ) side of the column. The reason they work with the signals is the power is back feeding thru the emergency switch.

Do the stop lights work?

 

no the stop lights do not work.

 

the switch at brake is ok.