which coil mfr. to trust? - Page 2 - Chevelle Tech
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post #16 of 51 (permalink) Old Sep 20th, 19, 7:10 PM
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Re: which coil mfr. to trust?

I've read all your posts and I know more than you.
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post #17 of 51 (permalink) Old Sep 21st, 19, 5:56 AM
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Re: which coil mfr. to trust?

doesn't everybody know more than Dave?
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post #18 of 51 (permalink) Old Sep 21st, 19, 9:07 AM Thread Starter
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Re: which coil mfr. to trust?

Thanks for the posts. I need to gain a stronger understanding of the electrical system. In doing some reading, I realized that maybe I need to look at the various connections, too. The alternator may be an issue as well, but the wiring/connections probably need some attention. This article was helpful

https://www.onallcylinders.com/2015/...a-classic-car/

I bought a napa alternator (63 amp) because it's a gorgeous weekend and I really want to use the car, but if the connections are corroded/weak, I could still be in the same situation after replacing it. Thinking I'll return it and get a powermaster since I'm hesitant to move the car now. But the only thing I'm running that's an additional draw over factory is the HEI and stereo. Both have been in the car for years, and I can keep the stereo off.
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post #19 of 51 (permalink) Old Sep 21st, 19, 10:12 AM
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Re: which coil mfr. to trust?

Like was said above, a weak alternator will not cause your hei module to fail. The coil will.

'71 chevelle, 468, TH400, 12 bolt posi w/3.08's, drinks a lot of 87 octane.
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post #20 of 51 (permalink) Old Sep 21st, 19, 10:22 AM
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Re: which coil mfr. to trust?

Quote:
Originally Posted by v8440 View Post
Like was said above, a weak alternator will not cause your hei module to fail. The coil will.
I agree.

I also agree with Mr. Ray's assessment of MSD's belief that the alternator may be causing the module to fail-it's HILARIOUS.

It's not causing your ignition component failures.

That said, it's never a bad idea to have a better alternator.

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post #21 of 51 (permalink) Old Sep 21st, 19, 1:04 PM
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Re: which coil mfr. to trust?

Instead of the stock 63 ampere alternator, I'd have gone with the stock GM 94 ampere 3 wire internally regulated 12SI alternator. They literally bolt in place of the stocker, and can be "clocked" to get the wires aimed to clear stuff if needed. Simple jumper, as outlined above makes it work just like a single wire Power-Master, and the charge light can be connected, if you have one.

Then, there are the new fully electronic regulators available that change the remote regulator operation to that of what the internally regulated ones operate as. Wells VR715 comes to mind.
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post #22 of 51 (permalink) Old Sep 22nd, 19, 7:39 AM Thread Starter
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Re: which coil mfr. to trust?

I didn't end up putting the alternator in because I tested the existing one and it's charging fine. 14.75 volts with nothing on. If I put the stereo and the headlights on, it drops to low 13's. Having just one or the other on, there's no significant change. I'm returning this one. If I do change it, I will get a higher amp one. Check some connections and replace the coil. Drove it around yesterday with the same coil and there was no issue. Do coils fail and then function fine again?
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post #23 of 51 (permalink) Old Sep 22nd, 19, 8:38 AM
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Re: which coil mfr. to trust?

Quote:
Originally Posted by jat70 View Post
Do coils fail and then function fine again?

Like a starter, when hot the coils can expand and short. You know, like a bad starter is fine cold but on restart you have to wait a while.
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post #24 of 51 (permalink) Old Sep 22nd, 19, 12:55 PM
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Re: which coil mfr. to trust?

To add to Paul's fine post above, coils are not so funny stuff. they have minds of their own, and fail at any time, but, testing them should be done as they are going to their full operating temperatures, not cold. This is why old resistance values are not sufficient to get the entire coil health profiles, running them off the car on a dedicated test machine, getting them hot....ARE.
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post #25 of 51 (permalink) Old Sep 22nd, 19, 3:37 PM
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Re: which coil mfr. to trust?

Just yesterday I replaced the coil in the cap of my hei with a remote coil setup. I had already bought the stuff to do it, and it started acting oddly at idle and just off idle. It would knock once every now and then, like over advanced timing but only a single knock. I figured it was either failing plug wires arcing or the coil starting to fail. I went ahead and did the coil upgrade, problem gone. Yes, coils can start acting up and then stop for a while.
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post #26 of 51 (permalink) Old Sep 23rd, 19, 10:18 AM Thread Starter
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Re: which coil mfr. to trust?

For now, I'm ordering the 8401 MSD dust cover and the O'Reilly coil with a bracket. Do I need a resistor or anything else to convert to external coil?
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post #27 of 51 (permalink) Old Sep 23rd, 19, 10:29 AM
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Re: which coil mfr. to trust?

Quote:
Originally Posted by jat70 View Post
For now, I'm ordering the 8401 MSD dust cover and the O'Reilly coil with a bracket. Do I need a resistor or anything else to convert to external coil?
No resistor, but add the Hei low resistance bushing I linked on the first page.
https://www.chevelles.com/forums/11147716-post7.html

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post #28 of 51 (permalink) Old Sep 23rd, 19, 11:05 AM
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Re: which coil mfr. to trust?

Also Jay, I bought a tool that unpacks the original spade terminals from their boots for a good cleaning. I did that 20 yrs ago, but still just replaced the "lighting" harness in the engine bay. It a handy little item for cleaning ALL connections, exe the bulkhead.

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post #29 of 51 (permalink) Old Sep 23rd, 19, 12:51 PM Thread Starter
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Re: which coil mfr. to trust?

Quote:
Originally Posted by Malibu ss 64 View Post
No resistor, but add the Hei low resistance bushing I linked on the first page.
https://www.chevelles.com/forums/11147716-post7.html
Is the one in the existing cap not usable for the conversion? I've read so much at this point I can't remember where I saw it, but I was under the impression I could use the one that's in there.

Quote:
Originally Posted by 427L88 View Post
Also Jay, I bought a tool that unpacks the original spade terminals from their boots for a good cleaning. I did that 20 yrs ago, but still just replaced the "lighting" harness in the engine bay. It a handy little item for cleaning ALL connections, exe the bulkhead.
Thank you both!
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post #30 of 51 (permalink) Old Sep 23rd, 19, 2:03 PM
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Re: which coil mfr. to trust?

Quote:
Originally Posted by 427L88 View Post
.....I bought a tool that unpacks the original spade terminals from their boots for a good cleaning...

Sounds interesting. What is this tool?

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