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#1 |
Red Headed Step Child
Join Date: Oct 2003
Location: Atlanta, GA
Posts: 1,216
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Attempting to crank new Crate motor
My dad has a 1972 Chevy Cheyenne that he has been working on. He's got his new engine in the truck and everything hooked up and is now trying to crank it.
He's got a Mallory magnet breakerless distributor. He's got 12V to the ignition wire when the AC is on. When trying to crank it it drops to 9V on the ignition wire. When the wire is connected to the positive side of the coil there are only 4.75V and there is no fire at the distributor. Tried 2 different coils and had no spark either time at the distributor. The ground appears to be good. Has anyone got any suggestions to what the problem might be?
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"Dinner, the perfect break between work and drunk" -Homer Simpson |
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#2 |
Registered User
Join Date: Apr 2003
Location: missouri city, tx
Posts: 4,486
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that really has to suck. are all the grounds hooked back up? is the battery low/does it need replacing? by ac do you mean air conditiong or accessories. it spins but no fire?did you do everything right installing the distributor?
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70 longbed 496/th400/Ford 9" |
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#3 |
Registered User
Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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are you still running the stock balist resister or resister wire? that will cause a drop in voltage. if you are still running it, make sure your distributer doesn`t need it. some mallery`s are a "unilight" and need the resister. the magnetic breakerless ones should`nt need it but read the instructions before disconnecting the resister.
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Anthony |
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#4 | ||
Red Headed Step Child
Join Date: Oct 2003
Location: Atlanta, GA
Posts: 1,216
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Quote:
Quote:
Our only guess right now is that it could be a bad distributor. Is there a way to test them? edit: Thanks for the help so far guys
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"Dinner, the perfect break between work and drunk" -Homer Simpson |
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#5 |
CCRider
Join Date: Feb 2000
Location: Olive Branch,MS,USA
Posts: 2,232
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If you have a meter the distributor is simple enough to test. Set the meter on continuity and connect it to the lead that goes to the coil and connect the other lead to ground. Turn the motor over with a rachet and you should get continuity in 8 places as the motor goes around. You could even use a test light by connecting one lead to positive on the battery.
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72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS |
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#6 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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if you're using the original wire to the distributor that's a resistor wire and should be replaced with a piece of 14ga wire to a switched outlet
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#7 |
F.A.S.T. president
![]() Join Date: Sep 2003
Location: Florida
Posts: 1,883
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Run a jumper wire from the batt. to the positive side of the dist. and coil. That would eliminate any switch or power drop probelms.
If that still doesnt work then the problem is in the coil or dist. You can check those parts just like tom hand said, a couple of threads up. |
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#8 |
Project Junkie! Fishing Poor!!
![]() Join Date: Dec 1999
Location: Olympia,Wa. 98512
Posts: 10,770
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This is just a remote chance, but have you checked the starter? Even new or rebuilt ones can cause problems like you are discribing if they are drawing too much amperage. That would be something else to check once you have eliminated everything else. WES www.ClassicHeartbeat.com
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