I have had this info written up for some time and meant to post so here it is. I will link to this from our Help Page:

1963/64 Cadillac Starting - Cranking System Basics

Wiring

You have a positive cable from battery to the large bolt on the starter solenoid, a yellow wire from the (R) side of starter solenoid switch to the ignition coil, and a dark blue wire from the (S) side of solenoid to the Neutral Safety Switch, which in turn is fed by the purple(violet) wire from the ignition switch. There is a large ground strap from right frame rail to transmission bell housing bolt to engine block.  The frame is grounded directly by the negative battery cable which attached to the frame on the right side just in front of the radiator support under the battery tray.

The Neutral Safety Switch Prevents Cranking in “Drive” Gears 
The blue and purple cranking circuit is closed when the shift selector is in Park or Neutral, and open in any drive gear in order to prevent cranking the car in gear.
  
Starting - Cranking
With ignition switch turned to far right cranking position, the purple wire feeds the 12 volts to the blue wire at the neutral safety switch which feeds the starter solenoid switch. The yellow wire from solenoid switch in turn provides a full 12 volts back to the ignition coil for cranking. When you release the switch and have the switch in "run" position, the voltage to the coil is reduced to 8 1/2 to 10 1/2 volts since current is then  provided through the brown resister wire, which gets it's current at the pink ignition wire under the dash.

Cranking Problems
One of the most important and overlooked components in the cranking circuit is the large ground strap that runs from the right frame rail over to the large bolt through transmission bell housing to engine and starter. If this is not connected and making good connection your starter will not work.   Check your ground strap and make sure it is making good connection.  If all other wiring is connected correctly, you could also have a bad ignition switch or melted and shorted ignition switch connector. Remove lower dash panel and disconnect the ignition switch connector and inspect closely with a light looking for melting and shorting. If all looks good, you can bypass the ignition switch and hot wire the car as noted below.
  
Hot Wiring
You can disconnect the large connector on the back of the ignition switch and hot wire the car by connecting the red (battery) to pink (ignition) wire and touching to Purple (starter).  I had a switch go bad on the way to a car show a few years back and made a quick 3 way jumper to hot wire the car. Here is a video showing how simple it is: http://6364cadillac.ning.com/video/hot-wired-ignition-switches
 
Bypassing the Neutral Safety Switch is Easy  

It is just a matter of unplugging the connector with the purple and dark blue wire and jumping the connector.  Be aware the car will no crank I any gear.

Views: 57

Reply to This

Replies to This Discussion

Great explanation of the starting system makes trouble shooting simpler understanding the color coded wiring 

Nice job Big guy ! 

Enjoy 

RSS

Photos

  • Add Photos
  • View All

Forum

Classic Cadillac Parts For Sale - Misc Items

Started by Jason Edge in For Sale. Last reply by Jason Edge 16 hours ago. 164 Replies

I have posted a few Misc items over on my Classic Cadillac Parts Facebook page at…Continue

Tags: classic cadillac parts, classiccadillacparts

Looking for 64 to 66 seat belt buckles, male and female together.

Started by Ryan Frawley in Wanted to Buy. Last reply by Tony and Ginny 429 18 hours ago. 5 Replies

Hey all, I am in the process of finishing up my 64 coupe deville and noticed that the front seat belts only have the retractor side in the bag I put all the belts in when I got it. I have found it…Continue

Tags: buckle, safety belt, seatbelt, seatbelts

Movie Star Cars.

Started by Kevin Campbell in General Discussion. Last reply by Kurt yesterday. 17 Replies

We have the Village Roadshow film studios about an 1.5 hour drive away.They've put out a call for cars to appear in a movie about Elvis. :-)So, I nominated our 64 Fleetwood as a potential "Movie Star…Continue

Current 1963/64 Cadillac Listings on eBay

Started by Jason Edge in For Sale. Last reply by Jason Edge yesterday. 0 Replies

To see all 1963/64 Cadillacs Listed on eBay in the USA…Continue

Tags: ebay

Blog Posts

Stuck at two red (dash) lights!

Posted by Jeff Kinzler on November 3, 2019 at 10:00pm 9 Comments

I hope someone can help solve these two electrical problems that appeared one after the other.

By way of background: The car, a '64 Eldorado has very limited use. It was at a restoration shop for 15 months until last January-  that supposedly did a bunch of wiring repairs including rebuilding the gas gauge that still hasn't worked properly, and the clock that hasn't worked, and re-soldering the broken wires in the drive door. All window and seat controls appear to be…

Continue

driveshaft help

Posted by wayne weaver on October 9, 2019 at 4:41pm 1 Comment

can anyone help me with a driveshaft ? I have a 1963 Cadillac 62 series 4dr with the hydro-matic trans. I need the male splined shaft on the front of the rear driveshaft section. the piece with the nut attached by clip.id be willing to buy a shaft if its not horribly priced.

Dash removal

Posted by Jake Mickley on October 9, 2019 at 12:06am 9 Comments

Hello everyone,

On a 63 CDV, if a guy wanted to remove the entire dash to get all the metal painted, and do some other things behind there, how would he go about doing that?  I checked here and the shop manual, but can't find a complete guide.

As always, and help or direction is appreciated.  Thanks!

--Jake

Introducing myself

Posted by Gary Marchand on October 7, 2019 at 9:32pm 8 Comments

Thanks for letting me join the club.  Picked up this ‘64 Coupe Deville a few months ago out of Beverly MA, the car has few stickers on it from various Cadillac clubs, didn’t know if anyone might recognize it from it’s “Glory days.” Everything seems pretty healthy except for the body and some very Mickey Mouse repairs, was wondering if anyone had any leads on…

Continue

Videos

  • Add Videos
  • View All

© 2019   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service