Can't turn off motor! - Impala Tech
Electrical & Wiring Troubleshooting electrical problems

 
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post #1 of 7 (permalink) Old 02-05-2014, 04:49 PM Thread Starter
 
 
Join Date: Jan 2014
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Can't turn off motor!

We have a 65 impala ss. Has a 350 in it and the wiring is pretty janky. It would not start when we got it and it had many wires hanging everywhere. We put in a new starter. It has one main positive connector and one extra small connector. We have the main positive connector going direct to the + on the battery and connected to the BAT terminal on the hei distributor. The other small connector goes to the ignition using a purple wire. The car does start now and run but it will not shut off with the ignition key. We can even remove the whole ignition switch from it's harness and it keeps running. We can disconnect the battery and it keeps running. To shut it off we have to pull the BAT wire from the distributor that goes direct to the starter. What is wrong?
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post #2 of 7 (permalink) Old 02-05-2014, 07:46 PM
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You have successfully hot wired the car. Something teen age boys did to borrow mom's car when she was at her garden club meetings on Saturday and dad was out the boys.

The HEI has to receive it's power you are supplying not from the battery (or the main battery terminal at the starter motor), but from the ignition switch. That way you can turn it off with the switch.

Big Dave
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post #3 of 7 (permalink) Old 02-05-2014, 10:02 PM Thread Starter
 
 
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HEI power

Dave, thank you! So I have the power coming from the main terminal on the starter to the HEI and a wire goes from the ignition to the only other small terminal on the starter. Do I just move the HEI wire from the main terminal over to the small terminal so that both that and the ignition wire are attached there? Thanks
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post #4 of 7 (permalink) Old 02-06-2014, 06:50 AM
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You need to follow the pink wire labeled "IGN" from the back of the ignition switch (bottom terminal in this photo).

http://www.classicindustries.com/ima...mg/l/ls451.jpg

It will exit through the fire wall behind the power brake booster if you have one (upper right corner when looking at it from the front of the car under the fender). It will then have a big plastic bead that covers the solder joint of where a piece of resistor wire is attached to the full voltage ignition wire. The wire changes color at this point and proceeds along the top of the dash to the coil.

Here is a wiring diagram for your car that may help:

http://www.classicindustries.com/ima...mg/l/ls451.jpg

You need to splice into the ignition wire before the resistor wire is attached. The resistor wire drops he voltage from 12 volts down to only eight volts to help the points last longer (but you have no points in an HEI and it wants full voltage to work). To get the car to crank up with more voltage to the coil (for a hotter spark) there was a wire from the starter that went up to the coil that was only energized with the key in the start position that by passed the resistor wire.

That is basically what was confusing you. The power is fed from the switch not from the starter when using HEI.

Big Dave
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post #5 of 7 (permalink) Old 02-06-2014, 09:31 AM
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That is helpful advice from Dave since you have an HEI system. If that doesn't work consider this: MSD states that if your car keeps running when you turn off the ignition with the HEI installed, you need to install a diode in the alternator wire. Diodes allow electricity to travel in one direction only. The MSD installation instructions shows where to put the diode and what size. In any event ditch the resistor wire Dave speaks of and provide a full 12v to the coil.
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post #6 of 7 (permalink) Old 02-06-2014, 09:43 AM
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Quote:
Originally Posted by wannaSS View Post
That is helpful advice from Dave since you have an HEI system. If that doesn't work consider this: MSD states that if your car keeps running when you turn off the ignition with the HEI installed, you need to install a diode in the alternator wire. Diodes allow electricity to travel in one direction only. The MSD installation instructions shows where to put the diode and what size. In any event ditch the resistor wire Dave speaks of and provide a full 12v to the coil.
The diode mentioned blocks feed back (current flowing from the wrong source) caused by energy passing through the "Generator/Battery" warning light in the dash back to energize your HEI.

The warning light circuit relies upon the resistance of the light bulb to prevent current flowing back into the ignition circuit, but some bulbs fail to provide sufficient resistance to prevent current from flowing. The diode provide in the installation kit adds a sufficient resistance to protect the distributor and the ignition module from the warning light circuit.

As I understand his problem he was basically hot wiring the car by providing a wire from the battery to the coil. Which is a great trouble shooting trick if you suspect you have wiring problems. By hot wiring the ignition you by pass all of the car's factory wiring to see if your car will crank up or not with the spark supplied by the hot wire.

Big Dave
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post #7 of 7 (permalink) Old 02-06-2014, 11:20 PM Thread Starter
 
 
Join Date: Jan 2014
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Thank you Dave. BTW, the second link is the same as the first one. If you have the correct link handy to the wiring diagram for the 65 Impala SS, that would be great. I'll see what I can work out this weekend. Thank you again.
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