'Bolters helping 'Bolters is a beautiful thing!

Search Search the 'Bolt - over 60,000 pages of info. Start here if you're hunting! Discussion Forums More than 18,000 registered Stovebolters from around the world talking old trucks. The Swap Meet FREE Classified ads for trucks, parts, truck citings, eBay / Craigslist, and other good stuff. Gallery Over 2,380 old truck stories with photos from Stovebolters worldwide! Tech Tips Helpful truck restoration, preservation ideas and project stories Links More than 725 useful sites for information, parts, services, and a "publications library" News What's new around the 'Bolt! Check in here often! FAQs Nothing new under the sun ... got some good Frequently Asked Questions here, and will probably have more! Features Sagas,Feature Stories, The "Roadkill" Commentaries, "It Ran When I Parked It" Photo Contests, Poster Contests, and some stuff we've done here and there and don't know where else to put it! Stovebolt Office Stovebolter Locator! FAQ's, Stovebolt Supporters, Contacting Us, About us, and other pertinent administrivia. Stovebolt Goodies 'Bolter wear and other goodies! Home Return to the home page

---

10% discount
for
Stovebolt Super Stars
(Read more about it)

Jim Carter
Classic Truck Parts

Preparing for Spring

THINK SAFETY

A Tech Tip Primer

The 60-66 Calendar

Stovebolt 2008
Calendars

Seven to choose from

Bolt Brag Mug!

HOW DO I WIRE MY TURN SIGNALS?

(Updated February 2008)

By Charlie "Cletis" Hardin

        Questions about wiring turns signals seem to be among the most common concerning these old trucks. Prior to 1954, they were not a factory option and until 1960 they were just that -- an option. Back in those days the hand signal was used. It served its purpose back then. But nowadays, most people would have no idea what you were signaling. So among the current safety items we add to our trucks, turn signals are near the top of the list.

        There are several types and brands of aftermarket switches available and many of our old trucks have been outfitted with them already. But if yours hasn't, here are some tips to guide you through it.

        One of the most popular brands is Signal-Stat. You can find wiring diagrams for several models of them on the web by typing “Signal-Stat” into your favorite search engine.

        There are three types of turn signal switches. The basic unit uses a separate set of lights while another type uses the same lights the brake lights use. The third type uses the brake lights and also incorporates an emergency flasher.

WIRING THE BASIC UNIT

        These will have five wires and are the simplest to wire up. The example I’ll use is a Signal-Stat Model 700. As previously stated, this unit uses separate lights from your brake light units so you will have to acquire some lights and figure out where you want them mounted. There are many variations on that so I won’t go into that. For the front signals, the parking light sockets can be converted for two-filament bulbs using kits available from most vendors. On many trucks you’ll see turn lights bolted to the top side of the front fenders.

        There are five wires on the Signal-Stat Model 700:

• Green- left front
• Red- right front
• White- left rear
• Black- right rear
• Yellow- flasher

        It will use a two terminal flasher. I recommend fusing the system. Pick up an in-line fuse holder and a 5-amp fuse when you buy your flasher.

Note: Disconnect the battery before wiring.

        You need to figure a way to mount your flasher. It can be as simple as taping it to your steering column out of view or you can use a flasher bracket from a donor vehicle. Run the in-line fuse wire from the accessory terminal of the ignition switch to the (+) side of the flasher. Connect the yellow wire from the switch to the (–) side of the flasher. Run wires from the switch to the individual lights using the colors listed above. Be sure your light units are well grounded.

       It’s as simple as that. Hook up the battery and check your work. Aren’t you proud of yourself?

WIRING A COMBINATION LIGHT UNIT

        For want of a better name I’ll call it that. This unit uses the brake lights for signaling turns. When engaged it sends power from the flasher to one brake light and power from the brake light switch to the other brake light. My example is the Signal-Stat Model 900. To use this one you people with older trucks will have to add a tail/brake light assembly on the right and convert your front parking lights as mentioned above.

        There are seven wires on the Signal-Stat Model 900:

• Green- left front
• Red- right front
• Gray- left rear
• Black- right rear
• Gray/Black- stop light switch
• Yellow- flasher (load)
• Blue- flasher (pilot)
  

        It will use a three terminal flasher and, again, I recommend fusing it.

Note: Disconnect the battery before wiring.

        This one is a little harder to wire but nothing a Stovebolter can’t handle. You already have a wire from the brake light switch to the left rear brake light. You’ll need to cut this wire near the brake light switch. Splice a new wire from the cut brake light switch wire to the Gray/black wire of your signal switch. Splice a wire from the cut brake line wire to the Gray wire of the signal switch. Run a new wire from the Black wire of the signal switch to the right brake light.

        (Note: If your truck had a right tail/brake light from the factory but no turn signals there will be 2 wires from the left light to the right. The one for the brake light will have to be cut and terminated. Leave the taillights connected to each other.)

        Run the wires to the front lights following the color code. Run the in-line fuse wire from the accessory terminal of the ignition switch to the (+) side of the flasher. Connect the Yellow and Blue wires of the signal switch to the (L) and (P) terminals, respectively, of the flasher.

        Make sure your light assemblies are all well grounded. You should be all wired and ready for a test run. Hook up the battery and check it out.

        If your truck is a Task Force or later you have a place for indicator lights in your instrument panel. These can be wired in using instrument light sockets from a parts truck wired to the front signal wires.

WHAT IF I CAN'T FIND A WIRING DIAGRAM?

        That's a very good question and I'm glad you asked it. As I said earlier, there are several brands of after market switches available. For many of them, you won't be able to find the wiring diagram. That's the problem I had with the factory switch for my 1954 GMC. So I used the following method to find out just which wire goes where.

        You'll need an ohm meter for checking continuity and a pencil and pad for writing what you find. It makes it easier if you have alligator clips for your meter. You need a grid to chart your findings on. I used a lined legal pad and drew vertical lines to make as many boxes as I had wires. Then I labeled the grid with the wire colors. It looks like this (the wires on mine are pink, white, black, yellow, light blue, dark blue):

        Now with the switch in the off position, clip your ohm meter lead to the first wire and check for continuity with each other wire. When you find continuity, place an X in that wire's square. After checking each wire move your lead to the next wire and again check each other wire. Mark your findings on your chart. Repeat until you have checked each wire to all the others.

        When I finished, my chart looked like this:

        Now put your switch in the left turn position and make another chart. Check each wire to the others and find where you have continuity in this configuration. Mark it on your chart. Now go to the right turn position and make a chart for it.

        My finished charts looked like this:

       OK, now it's time to put your powers of reasoning and deduction to work. Let's see if we can figure this out. The first thing we take into account is the fact that only the brake lights work when the switch is off. Looking at the "OFF" chart we see that pink, white and black all have continuity. From this, we can deduce that one is from the brake light switch and the other two go to the brake lights. But which is which?

        Let's have a look at that chart for the left position. In it we see that, of the three wires in question, only the white and black have continuity here. Aahaa! With our powers of deduction, we now know one of these is the power from the brake light switch and the other is to the right brake light. How do we know it's the right brake light? It's the one on when the left side is flashing.

        Now let's look at that right position chart. Here we see that white and pink have continuity. Aahaa again! The white one has to be the one giving the power and the pink one is the left brake light. That makes the black one the right brake light.

        OK, we have the brake lights figured out. What about the turn lights? Well, let's study those charts some more. We already know the left brake light is pink and the right one is black. So when the left signal is on, something is sending power to the pink wire. Looking at the chart we see it's the yellow wire. And what is that yellow wire doing with the switch in the right position? Why it's sending power to the black wire. But wait, it's also sending power to the dark blue wire. Using our reasoning powers, we know that has to be the right front signal. And looking back at the left position chart, we see that yellow is also sending power to the light blue wire in that position so that is the left front signal.

        Alright! We've got this figured out.

• White - brake light switch
• Pink - left brake light
• Black - right brake light
• Yellow - flasher
• Light blue - left front signal light
• Dark blue - right front signal light

        This system uses a two-terminal flasher. That is because it was designed to use indicators in the dash.  If the unit you are using has a indicator pilot light in the unit, you will need a three-terminal flasher.  The wire from the indicator light connects to the "P" terminal of the flasher. No matter what unit you have, if you chart it out like I showed you, you should be able to use those powers of reasoning and deduction to figure it out. This electrical stuff is easy if you just think about it.

        One more thing before I go. That 1954 GMC turn signal switch will work on your '54-55 Chevy and vice versa. You might be able to make it fit your '53 and older column, too. If anyone does, let us know in the forums. When you find one in a wrecking yard, be sure to also get the canceling bracket off the steering wheel while you're there. The same switch was used on the second series '55 GMCs for sure and possibly even later.

        Good luck and happy Stovebolting.

Cletis

        You can contact Cletis here or in the forums. To help Cletis avoid email phishing programs, his "encrypted email" is "charliehardin at netscape dot net". Also, check out Cletis' 1953 Chevy 6100 Yard Dog ~~ Editor

original submission v. Feb 05

-30-

Just remember -- restoring a bigger truck is not for the feint of heart, weak of arm or small of garage.