How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask ASEMaster35yrs Your Own Question

ASEMaster35yrs
ASEMaster35yrs, Master Auto Tech
Category: Classic Car
Satisfied Customers: 2032
Experience:  Master Auto tech since 1972,I own a 65 mustang and have built a 57 ford race car from the bottom up
10832065
Type Your Classic Car Question Here...
ASEMaster35yrs is online now
A new question is answered every 9 seconds

1957 Chevy: light switch..power to only one spade (tail lights)

Customer Question

1957 Chevy new light switch has power to only one spade (tail lights).
Submitted: 3 years ago.
Category: Classic Car
Expert:  jettadan1 replied 3 years ago.

jettadan1 :

is your bright light switch on the floor by left foot?

jettadan1 :

Let me know when you are ready to continue?

Customer:

Yes, it it.

Customer:

Headlights work when yellow headlight lead is touched to "tail light" spade.

Customer:

Are you still on line ?

Expert:  ASEMaster35yrs replied 3 years ago.

You may have it wired incorrectly or you may need a dimmer switch. Here is a close up of how the headlight switch & dimmer switch should be wired:

 

 

The tail lights are powered by the orange wire to the switch and it has a fuse on the fuse panel. If that fuse is bad, the dash lights won't work either. There are 2 hots running to the switch - the orange and the red wire. The orange wire gets power through a fuse that also powers the brake light switch, the dome light and the glove box light. Notice the junction of the orange wires in this diagram right above the headlight switch. http://www.tocmp.com/tOCMP/wiring/5765wiring%20diagrams/Chevrolet/MWireChev57_3WD-057.jpg

The red wire powers the headlights and the orange wire powers the tail and dash lights through the switch. When the switch is pulled out, the green wire goes to a 3 amp fuse on the fuse panel to power the dash lights.

The red "hot" comes from the ignition switch to the fuse box, headlight switch, ect. The red wire connects to the black wire on a double terminal on the ignition switch.

The white wire grounds the dome light ONLY, through the dash sheet metal when the switch is tightened on the dash. No other ground is needed. The instrument lights are grounded to the dash.

The dark green wire gets power through the rheostat on the light switch when it's on, from the orange power wire. The dark green wire goes to the 3 amp "inst lamp" fuse and then to all the dash lights on a gray wire. The gray wires are spliced together in the harness to go to all the dash lights.

 

In conclusion, the light switch has 2 power sources. The red wire supplies power to the switch to a thermal circuit breaker in the switch. In the first position power goes through the internal breaker to the front parking lights. In the 2nd position, it provides power to the headlights through the breaker. The front parking lights go out in the 2nd position. The orange wire provides power to the switch (through a fuse on the panel) along with the glove light, clock, dome light, and stop light switch. When in the 1st or 2nd position, the switch provides power to the tail lights and to the rheostat.

 

Forum link

http://www.trifive.com/forums/showthread.php?s=a6b17d042a0df576bd2cf118559df1f5&t=26258&page=2

 

Here are the wiring diagrams:

graphic

 

graphic

 

Here is a picture of your headlight switch:

 

Here is a picture of your dimmer switch:

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
 
 
 

Meet The Experts:

 
 
 
  • Dr. Hamman

    Technician

    Satisfied Customers:

    2111
    I have 30 years experience repairing, restoring, and customizing cars, and pickup trucks.
< Last | Next >
  • http://ww2.justanswer.com/uploads/themaxview/2008-07-29_002441_me2.png Dr. Hamman's Avatar

    Dr. Hamman

    Technician

    Satisfied Customers:

    2111
    I have 30 years experience repairing, restoring, and customizing cars, and pickup trucks.
  • http://ww2.justanswer.com/uploads/DaleFStockst/2009-9-12_162517_Dale's__Smile.gif Dale Stockstill's Avatar

    Dale Stockstill

    Automotive Diagnostic Technician

    Satisfied Customers:

    1034
    40+ years as a technical expert, especially Corvettes.
  • http://ww2.justanswer.com/uploads/semloh1950/2010-04-04_112645_me.jpg Don's Avatar

    Don

    Classic Car Mechanic

    Satisfied Customers:

    939
    30 years of experience and we have 4 classic cars our selfs
  • http://ww2.justanswer.com/uploads/HE/heavychevy396/2012-3-23_215048_NascarMike500x500.64x64.jpg Mike S.'s Avatar

    Mike S.

    Classic Car Mechanic

    Satisfied Customers:

    728
    A.S.E. certified with 25+ years experience.
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    ASE Technician

    Satisfied Customers:

    379
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/roadsidejerry/2008-12-7_17344_jerry.gif Road Side Jerry's Avatar

    Road Side Jerry

    Auto Mechanic

    Satisfied Customers:

    280
    classic car mechanic
  • http://ww2.justanswer.com/uploads/Guest/2008-01-30_172341_image0.jpg RIP ROBERT's Avatar

    RIP ROBERT

    Classic Car Mechanic

    Satisfied Customers:

    246
    35 plus years GENERAL REPAIRS & ENGINE OVERHAULS
 
 
 

Related Classic Car Questions