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Old 03-24-2004, 12:22 AM   #1
longhorn70gmc
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Location: Ridgecrest. CA, USA
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Need help!

Having trouble getting spark so the motor will start up. I have rebuilt the motor and changed everything to go along with it, like the distributer/points plugs/ wires. The dwell was set right. My truck was running strong after that.
Since the last time I started it, I have put new belts on it and put a fan shrould on it and changed both front fenders and now it won't start. I know none of this effects the engine getting spark but this is all I have messed with. It still had the original coil so Yesterday I bought a new coil and spark plugs. Still no spark. I was wondering if there was anyone whom might of had a problem like this and could please help or some local San diego located board truck members that I could hook up with. I need help troubleshooting this thing. Thanks again all,
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1970 GMC Sierra Grande 402/TH400
(Longhorn)14 years and counting rebuild!
1975 (Build) Chevrolet SWB 4X4 350 SB Lifted 6 inches
1970 Ford F250 Ranger 390 BB
2010 Ford Super Duty F250 XLT W/4 inch lift kit and Pro Comp Tires
Hub Cap Freak!
I need another truck like I need another hole in the head!
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Old 03-24-2004, 01:44 AM   #2
jhow66
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1st thing to do is see if you have power to + side of coil. (turn on switch and check with test light). Next test to see if you are getting power to + side of coil while cranking. If above test are ok remove dist. cap-turn on switch and open and close points to see if you get a spark(rubbing block of points has to be on a flat for this test). If no spark your points or condensor are bad. If you have spark to points check your rotor button and cap for burn thru or cracks.
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Old 03-24-2004, 01:58 PM   #3
Putter
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Watch your fingers. Ever tried to stop a mower or a tiller by pulling off the plug wire? PLUG WIRES will bite your @$$.
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Old 03-24-2004, 06:32 PM   #4
Hooter
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hmm do you have a good ground from the engine to the body, I am just throwing ideas out here, the coil wire could have melted somewhere or the resistor wire burned out, but as soon as you hook up a test light you'll be able to tell for sure if you have power there or not
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Old 03-25-2004, 12:28 PM   #5
longhorn70gmc
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Big thanks!

Thanks everyone. I will go home and start this process of troubleshooting. I will watch the wires so I don't get lit up.
Oh yea, Jhow66, If you go to Anderson county sometime to the Junk yards. There is one over there off of a main hi way in Powell that has a CrewCab 67-72, long Stepside, Green Gmc Truck. Original factory Looking Crewcab. When I visit my mom I always go there and see it. Thanks,
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Billy

1970 GMC Sierra Grande 402/TH400
(Longhorn)14 years and counting rebuild!
1975 (Build) Chevrolet SWB 4X4 350 SB Lifted 6 inches
1970 Ford F250 Ranger 390 BB
2010 Ford Super Duty F250 XLT W/4 inch lift kit and Pro Comp Tires
Hub Cap Freak!
I need another truck like I need another hole in the head!
I'M IN THE MARKET...AS IT WERE!
longhorn70gmc is offline   Reply With Quote
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