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Old 04-16-2020, 05:00 PM   #1
Dads 70 long bed
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My 70 won't start

My 70 C10 wont start.
new plugs, cap, rotor, wires, coil, points and condenser.
I put her in the garage to rebuild the carburetor.
Now, no spark. the points are at .030, the positive side of the coil reads 5.7 vdc
the negative side is zero. The run terminal on the starter solenoid reads 5.8 vdc I use the black side of my jumper cables to reference ground and clamp it to a spark plug to look for spark. I can lay the plug on the cowl to watch for spark, since I have no help.
Any ideas?
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Old 04-16-2020, 05:22 PM   #2
HO455
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Re: My 70 won't start

Just for clarification, the truck ran with the new plugs, wires, and points when you drove it into the garage? Then you removed the carburetor, rebuilt it, reinstalled it and now you have no spark?

And Welcome Aboard. We would all love to see pictures of your truck.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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Old 04-16-2020, 05:33 PM   #3
Dads 70 long bed
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Re: My 70 won't start

While I had the carburetor off, I reworked the ignition system. And now it won't start.
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Old 04-16-2020, 05:38 PM   #4
Corts60
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Re: My 70 won't start

That voltage is way too low. What is your battery voltage at the terminals? Sounds like you have a dead battery.
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Old 04-16-2020, 05:48 PM   #5
Dads 70 long bed
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Re: My 70 won't start

The voltage at the battery is 12.28
It cranks very nice.
No struggle at all.
But I have zero spark, not even a weak one. I'm sort of thinking it has something to do with my ignition switch. I'm still looking for a pin out on the switch so I can check it
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Old 04-16-2020, 05:50 PM   #6
HO455
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Re: My 70 won't start

What is the battery voltage when the starter is cranking?
How did you measure the voltage at the coil?
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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Old 04-16-2020, 05:49 PM   #7
tdangle
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Re: My 70 won't start

That voltage may be correct if the points are closed. Take the dist cap off and make sure you have a gap of about .019 when the heal of the points are on the high ridge of the rotor assembly. that should get you real close. also make sure you didn't short the points to ground with the condenser. If you watch the points while cranking they should open and then close. .030 is too big.
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1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC
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Old 04-17-2020, 09:39 PM   #8
HO455
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Re: My 70 won't start

Good work! And thanks for posting your success.
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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