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8N Cranks, but no start


 
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Jerry in VA
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PostPosted: Thu Aug 09, 2007 7:28 am    Post subject: 8N Cranks, but no start Reply to specific post Reply with quote

Hi. I was repairing some wiring around the terminal block, and caused a big spark. Should have disconnected the battery, but... Anyway, now it cranks, but won't start. Am going to check tonight for spark, using an old plug as suggested here.

Is it possible to have damaged the coil or condensor when I shorted something at the terminal block?

This is a front-mount distributor, 6-volt system, hybrid 8N chassis, 9N/2N engine.

Thanks in advance.
 
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eastexed
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PostPosted: Thu Aug 09, 2007 7:31 am    Post subject: Re: 8N Cranks, but no start Reply to specific post Reply with quote

you probably arced the points and they are stuck.
check for spark at plugs and trace back
 
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KCM
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PostPosted: Thu Aug 09, 2007 7:35 am    Post subject: Re: 8N Cranks, but no start Reply to specific post Reply with quote

You can't really damage anything downstream of the terminal block. Does the terminal block have a resistor attached to two posts? If so, you might have burned out the resistor which cuts down the voltage to the coil. Could have also damage the ignition switch. Do you have a two-post ammeter (not the loop style)? Could have burned it up with the short. Or might have caused a wire connection to lose contact with the arcing and the wire ends need to be cleaned. Best to take a voltmeter and work your way through the system starting at the battery to see if or where you lose the voltage.
 
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Jerry in VA
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PostPosted: Thu Aug 09, 2007 7:52 am    Post subject: Re: 8N Cranks, but no start Reply to specific post Reply with quote

I will check for spark, and do a little more troubleshooting. There is a ballast(?) resistor on the terminal block. It looks OK, but will check it with the ohm meter. Engine cranks fine, so don't think it is an ignition switch problem.

BTW, what is the purpose of the ballast resistor? Does it simply drop voltage to the coil?
 
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old
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PostPosted: Thu Aug 09, 2007 7:59 am    Post subject: Re: 8N Cranks, but no start Reply to specific post Reply with quote

Shorting something out like that will not hurt the coil, points, or condenser but it could have burned a wire and or fuse if it has one, never know if some one installed a fuse at some point seen more then one that had a fuse. Could also have smoke tested the switch there weak any how. I'd look for burned up wires and or the resister that if 6 volt will be bolted to the back side of the dash
Hobby farm
 
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KCM
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PostPosted: Thu Aug 09, 2007 8:18 am    Post subject: Re: 8N Cranks, but no start Reply to specific post Reply with quote

Could still be the switch as the starter does not go through the switch, just the ignition (engine will crank with the button by the shifter with the switch off). This is assuming it has an original style switch.

From what I've heard, the resistor is not a constant resistance, but changes as it heats up. When cold, it gives near full 6 volts to the coil for better starting. When hot, it cuts the voltage back to something like 4 volts to save on the coil and points. The resistors are cheap and not uncommon to replace just from breakage due to age.
 
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Jerry in VA
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PostPosted: Thu Aug 09, 2007 8:33 am    Post subject: Re: 8N Cranks, but no start Reply to specific post Reply with quote

KCM,

You are absolutely correct about the starter switch and the ignition switch. I will check the ignition switch as you suggest.
 
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souNdguy
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PostPosted: Thu Aug 09, 2007 11:01 am    Post subject: Re: 8N Cranks, but no start Reply to specific post Reply with quote

sparks usually mean a 'short'.. if you short a circuit.. generally only components upstream can be damaged.. downstream compnoents outside of the short circuit loop are generally untouched.

thus i'd trace wires back from where you saw sparks tot he battery.. damage will be in that section..

Soundguy
 
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Jerry in VA
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PostPosted: Sat Aug 11, 2007 10:59 am    Post subject: Problem Resolved: Re: 8N Cranks, but no start Reply to specific post Reply with quote

Did some troubleshooting with the multi-meter tracing -6V from the battery on, and found that I had a bad connection on one of the ignition switch wires at the switch. Maybe in all my futsing around I moved that wire enough to cause a high-resistance connection. Re-soldered the wire, and she started right up! Fascinating.
 
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