72 Chevelle 402 No Start/Won't turn over - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 8 (permalink) Old Jul 23rd, 16, 2:20 PM Thread Starter
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72 Chevelle 402 No Start/Won't turn over

Hello everyone,

I have the majority of my car restored but it won't turn over. I have all factory rebuilt parts or nos parts. I tested the starter, jumped the neutral safety switch, and when i turn the key to the start position i hear like a fan motor turn on until i release the key from the start position *it is not the blower fan*. I adjusted the ignition switch on the column but didn't seem to make a difference. I have a nos horn relay but not sure if that's the issue or not. All the dash lights work, am fm 8 track works, etc. I did hook up my battery jump starter to insure they're was enough power to start it. When the key is in the start/cranking position, the amp gauge goes to -40 and the temp gauge pegs past 250 degrees. Is this a ground problem? Im clearly not the best at electrical. Any help is appreciated.
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post #2 of 8 (permalink) Old Jul 23rd, 16, 2:26 PM
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Re: 72 Chevelle 402 No Start/Won't turn over

You need to see if the whirring sound is your starter motor spinning without the solenoid kicking out. My theory on your gauges pegging is they have been swapped in place of the original idiot lights and the lamp test wire has not been removed that light the lights in the start position.

Your just jealous because you can't hear the voices!

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post #3 of 8 (permalink) Old Jul 23rd, 16, 2:30 PM Thread Starter
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It is a factory tach cluster car so that cant be the problem. When the key is in the on postion the gauges are in the correct locations.
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post #4 of 8 (permalink) Old Jul 26th, 16, 11:57 AM
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Re: 72 Chevelle 402 No Start/Won't turn over

It sounds like the starter has got the wires backwards or switched around and your starter motor is spinning without engaging the flywheel.That might explain the "fan motor sound".If that is the problem check the wiring at the starter.
ON your starter solenoid: The purple colored wire from the ignition should go to the "S" terminal on the solenoid.The "R" terminal gets the points or resistance wire and obviously the large lug gets the battery's positive "+" red wire.

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post #5 of 8 (permalink) Old Jul 31st, 16, 3:55 PM
rkd
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Re: 72 Chevelle 402 No Start/Won't turn over

Some country boy checks.

Jack the car up and unhook the wires at the solenoid by the starter and run a temp wire that you can touch to the bat plus term. Then see if that cranks it.

If so, the starter works and the circuit needs attention.

The starter wiring in these can be a pain because power goes to the ign switch, then via the neutral safety switch, and, or clutch switch, etc. If the starter works, get a wiring diagram and check for voltage until you find the prob.

Best to buy a wiring diagram for the car, it will save a ton of effort.

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post #6 of 8 (permalink) Old Jul 31st, 16, 11:13 PM
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Re: 72 Chevelle 402 No Start/Won't turn over

fat purple wire goes on the stud closer to the block.

smaller yellow wire goes on the stud furthest from the block.

Anybody know, does the power feed to the rest of the car come off the battery post on the starter or from a pigtail off the positive battery post?

My car is a 70, it has a pigtail off the pos battery terminal .

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post #7 of 8 (permalink) Old Jul 31st, 16, 11:20 PM
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Re: 72 Chevelle 402 No Start/Won't turn over

Chevelle402SS, (name? location? please fill out your profile)

Use a test light, hook the ground clip to a good ground like the park brake bracket. probe the neutral safety switch at the bottom of the column. two big purple wires, both should have power when the held in the start position. if not, issue is upstream towards the actual ignition switch.

Try to avoid terminal frustration. it's tough when you're this close. Don't worry, we've all been there.

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post #8 of 8 (permalink) Old Jul 31st, 16, 11:23 PM
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Re: 72 Chevelle 402 No Start/Won't turn over

the NSS can far enough out of adjustment to cause this problem.

careful here, it's possible to start the car in gear when working around this stuff. real bummer when that happens. especially if it's got a choke and it's up on the fast idle. There have been sad cases.

Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.
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