Home page
SPONSOR AD

Support our Vendors!  |  Advertise Here

NEW! Check out our new Corvette Quiz!

Topic: 1969 Starter Issues

in Forum: C3 Electrical


Already a Member?
Login
Not yet a Member?
Register for Free!

1969 Starter Issues (1/8)
 9/25/23 3:37pm
SteveG
Limited Member
Send Private Message

Arlington, TX - USA

Vette(s):
1969 LeMans Blue Coupe 390/427 4sp 2016 Stingray Convertible 7sp


Joined: 2/23/2003
Posts: 14

I have a 1969 L36 big block.  The car only starts after turning it over for a few seconds and releasing the key (back to on).  It may take two or three tries for it to start.  It very seldom starts with the key in start position while cranking.  It is something I could live with, but would be a problem for someone else driving the car.  Any thoughts or ideas?

Our Sponsors help support C3VR
Re: 1969 Starter Issues (2/8)
 9/25/23 6:29pm
manchestersharkLifetime Member
Lifetime Member
Send Private Message

Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 2403

Not sure I completely understand the situation. But, if it's electrical, the switch is not making contact. If it's turning over at each attempt, it sounds as if the carburetor is bled down, no pressure, it needs to build. Hench the need to crank more. Are you pumping it or setting the choke at all when you first attempt it? Does it have a electric or mechanical fuel pump? 



______________


Click on image for full view

Re: 1969 Starter Issues (3/8)
 9/25/23 6:58pm
SteveG
Limited Member
Send Private Message

Arlington, TX - USA

Vette(s):
1969 LeMans Blue Coupe 390/427 4sp 2016 Stingray Convertible 7sp


Joined: 2/23/2003
Posts: 14

Thanks for the reply.  I normally pump it one time before cranking it.  The issue is it will crank, but not start until I release the key.  It has the transistor ignition and the mechanical fuel pump.  It is as if the distributor or coil is not getting the proper voltage while the switch is in "start".  It normally will only start after the key is released from "START".

Re: 1969 Starter Issues (4/8)
 9/25/23 7:39pm
BillHanna
Standard Member
Send Private Message

Cana, VA - USA

Vette(s):
1975 Stingray 71 350 engine Flat top pistons Sniper fuel injection Hyperspark ignition Vintage Air air conditioning Borgeson power steering box


Joined: 7/3/2016
Posts: 329

Ignition switches have a number of contacts -- one for START (power to the starter motor) only, one for RUN (power to the ignition system) only, and another for START and also RUN.

It sounds like while the key is in the start position, it is only supplying the START power to the starter, but not the RUN power for the ignition system.  When you return the key back from the start position, it then powers the ignition system, and since the engine is still turning from the attempted starter cranking, it fires off.

This could be a bad ignition switch (located a ways down the outside of the steering column), or maybe a broken wire.



______________

   

Re: 1969 Starter Issues (5/8)
 9/25/23 10:05pm
Adams' AppleLifetime Member
Lifetime Member
Moderator
Send Private Message

Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 20144

It sounds like you are not getting 12v from the starter solenoid while cranking, but you are getting voltage from the ignition switch in the "run" position. I would suspect a wiring break between the starter solenoid "R" terminal(pink wire at the dist connector, may change to yellow at the starter...it will be the small terminal to the OUTSIDE of the car on the solenoid) to the connector at the distributor. As a test, you could jumper 12v to the pink wire in the connector and see if it fires up properly that way. If so, look for a problem in that wire from the solenoid, or possibly a bad connection there at the distributor connector.

'69 TI wiring diagram

Another thought...it's possible the starter solenoid is faulty, and not making contact for the "R" terminal while cranking. Never actually ran into that particular issue, but it IS possible.

oh...one last thought...you let other people drive your Corvette?!?!!? 🤣 😁




|UPDATED|9/25/2023 7:05:37 PM (AZT)|/UPDATED|


______________

Joel Adams
C3VR Lifetime Member #56    

My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Re: 1969 Starter Issues (6/8)
 10/2/23 7:10pm
SteveG
Limited Member
Send Private Message

Arlington, TX - USA

Vette(s):
1969 LeMans Blue Coupe 390/427 4sp 2016 Stingray Convertible 7sp


Joined: 2/23/2003
Posts: 14

Joel, Thanks for you detailed reply.  With key in ON position without engine running, I have 7.7 v at both the connector going to distributor and at the R terminal on the solenoid.  When I go to START the voltage jumps to 9.8 v at both the connector and at R terminal.  After it starts it maintains the 9.8 v.  It will vary between 9.8 and 10.2 v depending on engine RPM.  I also checked the voltage at the + terminal of the coil and it reads 2.7v which seems low.  Any other thoughts?  BTW, all three kids learned to drive in the Vette.

Re: 1969 Starter Issues (7/8)
 10/2/23 10:34pm
Adams' AppleLifetime Member
Lifetime Member
Moderator
Send Private Message

Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 20144

Steve, I believe you should have battery voltage at the dist connector while cranking. 9.8-10 v prolly won't do it. After starting, with the key in the "Run" position, the resistor wire drops the voltage back down to around 9v. I think what you are seeing on your voltage tests is the voltage from the resistor wire traveling down to the "R" terminal. My bet is the starter solenoid is not allowing full batt voltage to the dist while cranking. I would, as a test, jumper batt voltage to that dist connector(pink wire) and see if it fires up quickly, as it should. If so, I would have to think the solenoid is the problem. If not, the pulse amplifier may be the culprit.

I have a short article on the TI system I will e-mail you. It basically describes the system, and gives a little diag info...but not much. 



______________

Joel Adams
C3VR Lifetime Member #56    

My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Re: 1969 Starter Issues (8/8)
 10/2/23 10:41pm
SteveG
Limited Member
Send Private Message

Arlington, TX - USA

Vette(s):
1969 LeMans Blue Coupe 390/427 4sp 2016 Stingray Convertible 7sp


Joined: 2/23/2003
Posts: 14

Thanks. I will try the jumper wire. 

Our Sponsors help support C3VR