Topic: C9AF-11450-A Starter Solenoid Applications?

[sah62]

What's the current thinking on the original applications for the C9AF-11450-A heavy duty starter solenoid? The Osborne assembly manuals describe it as an alternative, but they don't explain which options/applications called for its use.  The Master Parts Catalog doesn't separate it by application, either.

One interesting note: though not listed as a service part in either the 1970 or 1975 editions of my Ford car MPCs, I found a C9AZ-11450-A service part number for this solenoid in one of my cross-reference manuals.  Was it ever sold as a service part?

[sah62]

Nobody has any ideas?

Jeff, I remember you saying that there were three different styles used.  Do you still have the pictures that show the differences?

[J_Speegle]

There are a couple of different camps and I think none of them have been proven so I think that is why everyone is hesitant to post their hard found belief

It is my understanding that some believe its an early late thing with only certain cars receiving them in the later half of 69. While others believe it was a item related to the HD charging system and lastly there are some that believe its was a random application (intermixed with a "plan to use them on certain cars") during 69.,

Yes I've identified at least three different versions (likely different IMHO suppliers) used during the late 60's- into the early 70's)

[sah62]

Thanks, Jeff - would you mind if I used these pictures on an ID page with appropriate credit given to you as the source?

How are they judged in the concours and thoroughbred show classes?

[J_Speegle]

Thanks, Jeff - would you mind if I used these pictures on an ID page with appropriate credit given to you as the source?

OF course - Might have a better- higher resolution set of pictures if you would like

How are they judged in the concours and thoroughbred show classes?

Since the application is not and has not (in the past) included in the rules specifically we leave it up to the experiences (collectively) to make the call until we get some solid information and direction to the judges as a group. In general, at the moment, I would expect that the judges would give the benefit of the doubt (either one) at this moment. At the same time it's discussions like this one that often bring the issue to the forefront and beg for a conclusion

That is MCA, as I currently understand it. In other organizations I know that some of the Head Judges have their requirements so its up to the owner to conform (we did for SAAC on the GT350 I helped with) for that particular show or take the point losses.

[PerkinsRestoration]

Scott, It's my opinion and MCA Thoroughbred Class requirement that all 69 Boss 302 and Boss 429 have the Round relay. It's also my opinion that all 69 Dearborn 428 CJ's including Shelby used the round relay. It's my opinion  that the round relay was used on all applications at DAP after OCT/Nov. 1968. Even the 800 mile 200 6 cyl. Coupe I have used the round relay. I don't believe the round relay was anything more than a vendor/supplier thing like the '"Dearborn" radiator caps. The third relay in Jeff's picture will likely have a date code after 69-70 production? Again this is only my opinion. I'm sure there were exceptions, but feel the above observation's are a accurate reflection of what was normal production for DAP 1969 model year. I know other assy plants also used the round relays but don't have enough info to have an opinion?

[sah62]

The third relay in Jeff's picture will likely have a date code after 69-70 production?

Thanks, Bob.  I think you're right about the third type.  I have one like that with a 1971 date code.

[J_Speegle]

Yes the third type has a 71 date code on it  but carries the C9 number you asked about

[SCJSTU]

Bob,
dumb question....which one is the pic is the round version you are referring to?

[PerkinsRestoration]

The one on the right.

[JohnSlack]

Does anyone have a source for a reliable good solenoid like these?



John

[Bob Gaines]

Does anyone have a source for a reliable good solenoid like these?



John

Check with David at DSD restorations . He was restoring them for a time.

[Bob Gaines]

I agree with BP in that it was a vendor variation opposed to the urban myth that they were heavy duty. Understandable given they were most notably seen on Boss cars and Shelby's I can see how the heavy duty myth evolved. The inside components do not show evidence of being heavier duty then the inside components of the more common one seen in most cars of the period. 

[JohnSlack]

I agree with BP in that it was a vendor variation opposed to the urban myth that they were heavy duty. Understandable given they were most notably seen on Boss cars and Shelby's I can see how the heavy duty myth evolved. The inside components do not show evidence of being heavier duty then the inside components of the more common one seen in most cars of the period.

I agree with that also BG, basing my search on BP's quoted "Scott, It's my opinion and MCA Thoroughbred Class requirement that all 69 Boss 302 and Boss 429 have the Round relay." I am looking for one for my 1969 1/2 BOSS 302, so that is the explanation of my search.

Thank y'all for your time and assistance. It is very much appreciated.

John