1970: Alternator wire harness ground strap?

[Terry M.]

Re: 1970: Alternator wire harness ground strap?

Terry,
Does your LT-1 have the bracket on the alternator?

Monte

Yes, it does; and it also has the AIR system check valve as shown in Keith's original photo. No 1970 LS5 that I know of was originally equipped with an AIR system, which is why I posted yhe comment that picture is not from a 1970 LS5.

I have seen these brackets clocked differently for BB & SB and especially BB with PS. I suspect these differences are due to the orientation of the alternator and consequently of the connector for the alternator field windings. These different clockings will result in different configuration of the two tabs on the tail end of the bracket. Those tabs are to stop the bracket from rotating in service since there is only one bolt holding it to the alternator rear case half. The tabs rest against the alternator case to provide a second point of contact.

Once the bracket is removed one has to be very careful to reinstall it with those tabs located as original. I believe the many different configurations one sees are from careless re-installation by people who do not understand their function.

[Kenneth B.]

Re: 1970: Alternator wire harness ground strap?

1970 base motor alternator with bracket[ATTACH=CONFIG]52312[/ATTACH]

This is what my 70 LT-1 bracket looks like. Tabs are bent down somewhat like this pict. Alternator has NEVER been apart.

[Keith M.]

Re: 1970: Alternator wire harness ground strap?

Keith,
After looking at a ton of these the difference seems to be where they are bent on the hoop end.
My guess is, if you were to loosen yours and rotate it a bit it, there is a very good chance that one of the tabs will drop into a hole on the alternator.

Of the three that are here, two had one tab in a hole while the other tab hung over the outside of the alternator. The third was was like the picture you posted. The hoop end of the bracket was very close to the middle of the alternator. I loosened the bolt on the bracket, moved the bracket to where it was on the other two and it tightened right down.

It did NOT look like it would fit as the others did, but it did, no problem.

Loosen the bolt and see if it will line up like the rest of the pictures.

Let us know how it turns out.

Hi Monte,
I'll check when I get home tonight.

And thanks to all that posted.

[Paul O.]

Re: 1970: Alternator wire harness ground strap?

Here are a few photos do not remember the car but dug deep into photo file hope it helps. You would have to copy file and enlarge it.

[Keith M.]

Re: 1970: Alternator wire harness ground strap?

One more try. Does anyone have a spare strap they would be willing to sell? Thanks.

[Keith M.]

Re: 1970: Alternator wire harness ground strap?

One more try. Does anyone have a spare strap they would be willing to sell? Thanks.

Update: I found a used one.

[Alan S.]

Re: 1970: Alternator wire harness ground strap?

Hi Keith,
Good for you!
I'll bet you didn't need to take out a home equity loan like you might have had to for certain fasteners, either!
Regards,
Alan

[Jim T.]

Re: 1970: Alternator wire harness ground strap?

I came across this picture. Can someone tell me if that metal strap holding the wire harness was stock for a 1970 BB? And if so, doesn anyone know where i could get one? Thanks.

Keith the large qauge red wire in the alternator plug-in in is larger gauge wire than what is fitted into my alternator plug-in on my 1970 350 with air conditioning. Is this a Corvette picture?

[Keith M.]

Re: 1970: Alternator wire harness ground strap?

Jim, i don't think it is. I saw the strap in one of my vette reference books and noted I was missing it and did a google search for a representative pic.

[Rey S.]

Re: 1970: Alternator wire harness ground strap?

I bought my wiring harness from M&H Electric and it came with said "ground strap" I have contacted M&H about some things and it seems they do not sell individual components. Is this strap truly a "ground Strap" or is it just a support strap for the way the wires are bent?

[Joe L.]

Re: 1970: Alternator wire harness ground strap?

I bought my wiring harness from M&H Electric and it came with said "ground strap" I have contacted M&H about some things and it seems they do not sell individual components. Is this strap truly a "ground Strap" or is it just a support strap for the way the wires are bent?

Rey------


It attaches to the grounding lug of the alternator but it has no grounding function, at all. It is simply a support for the wires.

[Mark E.]

Re: 1970: Alternator wire harness ground strap?

While researching how the wiring harness and its bracket should be positioned behind the alternator of my 1970 454, I found this thread which just confused me.

- Posts #7 and #8 are small blocks (I think).

- Post #12 by Paul shows photos of a Bowtie 1972... Was the harness really pinched between the alternator and bracket as shown? Doesn't this risk a short as the wires rub between the bracket and alternator case?

- Is 1970 the same as 71-72 454s? If not, could someone post a photo for a 1970 454? The photos in post #19 are too small to see details.

The only reference in AIM I found is page 12-A7 (Electrical section), which shows the alternator clocked for a small block. Nothing in the LS5 section.

Thanks guys!

[Mark E.]

Re: 1970: Alternator wire harness ground strap?

Referencing my prior post- anyone in the know about this?

I thought I knew the proper clocking/positioning of the alternator, harness, and bracket until I saw the photo of the Bowtie example in post 12.

I'm working on a '70 454 with PS.

[Mark E.]

Re: 1970: Alternator wire harness ground strap?

Any insight about this is appreciated.

[Patrick H.]

Re: 1970: Alternator wire harness ground strap?

I thought I knew the proper clocking/positioning of the alternator, harness, and bracket until I saw the photo of the Bowtie example in post 12.

Which one is post 12?

I mention this because the post number will change depending on how you view the thread (Hybrid, Linear, etc). I can tell you that your numbers of photos don't match my viewing at all. Post numbers are dynamic, not static, so referencing them doesn't do much good.