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Re: Start Me Up
There are two wiring paths to the ignition. One is active when cranking the the engine (start mode) and full power is applied to the coil to compensate for the 'drag' effect of the battery supplying starter motor current. The other path is engaged when you release the starter switch (run mode) and reduced voltage waveforms are applied to the coil.
Symptoms like you describe are typically the result of a faulty wiring harness and a good local auto electric shop can diagnose and fix the problem pretty quickly for you. -
Last LT1 that hadT.I. was 1971 model year *NM*
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Re: Start Me Up
try replacing the ballast resistor, white ceramic block,hope that helpsComment
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Re: Start Me Up
The last Corvette with a ballast resistor installed at the factory was 1967. For 1968 and newer Corvettes a resistance wire in the wiring harness takes the place of the ballast resistor.TerryComment
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Re: Start Me Up
As suggested, the wiring from the starter solenoid to the coil is open OR possibly the starter solenoid itself has a problem and not making the contact during the start mode. Look at your wiring diagram for a wire running from the solenoid to the coil. It should be a #20 yellow coming from the "R" pole on the solenoid to the coil. Duplicate that wire with a jumper to determine if the wire is open somewhere or the solenoid itself is faulty in this circuit.
Good luckComment
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Re: Start Me Up
Steve, it's interesting that you implicate the starter solenoid and/or solenoid wiring because I had the solenoid replaced at the local Corvette shop last summer around the time this started. I'll definately check that out.
As for the TI, well, the car definately has it despite the wealth of experience here that suggests it didn't leave the factory with it. I'm guessing that was an 'upgrade' back in the day?
Thanks for all the advice!Comment
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Re: Start Me Up
Stupid question...but are you sure you have a '72? Where is your T.I box located? It just kindof boggles me that somebody would put a T.I. distributor, coil, wiring harnesses, and module on a '72, as it's not original and costs a lot of money to do. BELIEVE ME, I KNOW. Transistorized Ignition = $$$. Even back in the day, it couldn't have been cheap, and H.E.I came in '73, '74, somewhere 'round there, which would have been a more logical "upgrade". Interesting.....Who knows, if you have a really early build car....Comment
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Re: Start Me Up
Well, according to the VIN, the colour (Elkhart) the warranty book and the PO it's a '72, nothing other than the presence of the TI suggests otherwise.
I can see the TI box from the front of the car with the hood open mounted to the right of the hood. I'll take a picture of it tonight and post it. I too wonder why the heck anyone would go to the trouble and expense. Did someone really hate points that much?
BTW, I think (not sure) that it was built in May of '72.
Thanks!Comment
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Re: Start Me Up
If memory serves, the TI K-66 stopped being a factory discrete option in 1970 and was installed only with certain HP engine packages like LT1 in '70 and '72. But, that ended in '72 with only the very rare ZR1 form of LT1 (20 cars built) leaving the factory with TI...Comment
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Start Me Up
Not even the 1972 ZR1s got TI. 1971 was the end of the road for factory installed TI on COrvettes.TerryComment
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Re: Start Me Up
Scott, my long-gone Jan 72 built LT1 had points. So I don't think early build with TI could be a possibility/explaination your car having TI.BobComment
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...And even if it WAS original......
You'd never see the T.I. box in the engine compartment. Chevy decided to make the thing a royal pain in the tushie to get at, inside the friggin' front drivers side fender. What's the number/date on the red tag on your distributor? Just curious.Comment
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Re: Start Me Up
Right of the hood? Right is passenger side, LH is drivers side where the T.I. box on earlier cars normally resideDick WhittingtonComment
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Re: ...And even if it WAS original......
Ok here's a picture of the box. It is under the drivers' side fender I can see it easily from the front of the car with the hood open. Is this the normal spot for it? I know it's not original which is probably not necessarily a bad thing. The car is a driver so at this point I just want to make sure it's working correctly. I appreciate you folks bringing this to my attention, now if it ever acts up I won't spend a pile of money restoring it I'll just turf it in favour of a 'correct' setup.
So...here's a question. Assuming that this is a TI setup what wires should be connected to the coil? I have a brown wire connected to the negative terminal which I was able to trace back to the TI box, and theres a black wire that's grounded on the coil bracket on the intake manifold. On the positive terminal I have a white wire that goes into the wiring harness that heads back to the TI box, if it re-emerges at the TI box its a different color at that point. Should there be a wire from the R-terminal on the starter solenoid to the + side of the coil as with non-TI setups?
As for the red tag on the distributor, I can't find one. Where would that be?
Man! I need to get a wiring diagram!
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