1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp???

[Scott S.]

1967 coupe with radio.

UPC U69-A1 calls out GM 106652 Fuse for the receptacle labeled "Radio" on the fuse block under the dash. The GM 106652 fuse is listed in the P&A, Gr. 8.965, as a 3 amp fuse, 1-1/4" length. The Fuse block itself has amp ratings next to each receptacle in white letters, the amp rating for "Radio" says 10 amps. The 1967 Owner's Manual calls for a 3AG/AGC 10 amp Radio fuse (p. 55). The GM Restoration Package calls for an AGC 20 Fuse for the Radio.

Since the fuse block itself says 10 amp (red color-band?), backed up by the Owner's Manual, that's probably the safe choice, but is it the correct choice?

The Revision Record (U69-A1) says the previous fuse was GM 9419783, a 2.5 amp fuse, changing to the 3 amp GM 106652 on 6-15-66. Why does the AIM call out a 3 amp fuse for a 10 amp application?

[Joe R.]

Re: 1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp??

1967 coupe with radio.

UPC U69-A1 calls out GM 106652 Fuse for the receptacle labeled "Radio" on the fuse block under the dash. The GM 106652 fuse is listed in the P&A, Gr. 8.965, as a 3 amp fuse, 1-1/4" length. The Fuse block itself has amp ratings next to each receptacle in white letters, the amp rating for "Radio" says 10 amps. The 1967 Owner's Manual calls for a 3AG/AGC 10 amp Radio fuse (p. 55). The GM Restoration Package calls for an AGC 20 Fuse for the Radio.

Since the fuse block itself says 10 amp (red color-band?), backed up by the Owner's Manual, that's probably the safe choice, but is it the correct choice?

The Revision Record (U69-A1) says the previous fuse was GM 9419783, a 2.5 amp fuse, changing to the 3 amp GM 106652 on 6-15-66. Why does the AIM call out a 3 amp fuse for a 10 amp application?

Scott,

What A.W.G. is the wire coming off the fuse? That will tell you how much current the wire can carry. I suspect that 10 A is the right answer, though. 3 amps is pretty small for an automotive fuse.

Joe

[Peter L.]

Re: 1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp??

Scott/Joe - I checked the Radio Fuse Designation in a 66 Corvette Fuse Panel I have and it indicates 3A, but the January 1966 Corvette 1966 Owner's Guide calls for a 3AG/AGC 2.5 amp fuse. I have seen one very original no radio 67 and there was no fuse in the RADIO position, but one data point doesn't mean much and a fuse can be readily removed.

Since the the 67 Fuse Panels were loaded with the fuses at Packard Electric instead of at St. Louis except for the fuse 20A fuse "called out" for the CLK LTR CTSY HAZ receptacle in the 67 Corvette AIM so the lower fuse panel screw could be installed without have to remove the fuse, I'm wondering if the RADIO fuse was installed in all Fuse Panels because most cars had the radio. Less of a PITA to remove one fuse for a no radio car than to put one fuse in all the cars that had radios.

This still doesn't explain the fuse "call out" in the U69 Section of the 67 AIM, except the production folks didn't have to concern themselves with it, so the AIM didn't get changed and I would expect that Packard Electric's work instructions called for the 10A fuse in the RADIO receptacle which is consistent with the Fuse Panel marking and the 67 Corvette Owner's Manual and most likely the 67 Shop Manuals. Also, the 68 -78 Corvettes call for a 10A RADIO fuse for what it's worth.

Another confusing situation we're trying to figure out 40 plus years later.

Pete

[William C.]

Re: 1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp??

MAN is it tough to read a print printed from microfilm! The '67 Radio slot was indeed labeled 10A, Circuit #43, 20 gauge yellow wire. Fuse 10 amp Red dot or stripe depending on the fuse supplier

[Scott S.]

Re: 1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp??

Scott,

What A.W.G. is the wire coming off the fuse? That will tell you how much current the wire can carry. I suspect that 10 A is the right answer, though. 3 amps is pretty small for an automotive fuse.

Joe

Joe,

I'm not sure about the wire gauge, I added it to my list of things to check next time I'm over to work on the car.

[John H.]

Re: 1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp??

This site on wire and current might be of some interest.http://www.powerstream.com/Wire_Size.htm

[Scott S.]

Re: 1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp??

Scott/Joe - I checked the Radio Fuse Designation in a 66 Corvette Fuse Panel I have and it indicates 3A, but the January 1966 Corvette 1966 Owner's Guide calls for a 3AG/AGC 2.5 amp fuse. I have seen one very original no radio 67 and there was no fuse in the RADIO position, but one data point doesn't mean much and a fuse can be readily removed.

Pete,

That makes sense. The 1966 AIM calls out the 2.5 amp GM 9419783 Fuse on U69-A1. The usage of the 2.5 amp fuse (GM 9419783) goes back through the 1964 AIM. The 1963 AIM calls out the 148511 Fuse, which is 4 amps.

Since the the 67 Fuse Panels were loaded with the fuses at Packard Electric instead of at St. Louis except for the fuse 20A fuse "called out" for the CLK LTR CTSY HAZ receptacle in the 67 Corvette AIM so the lower fuse panel screw could be installed without have to remove the fuse, I'm wondering if the RADIO fuse was installed in all Fuse Panels because most cars had the radio. Less of a PITA to remove one fuse for a no radio car than to put one fuse in all the cars that had radios.

I just read the article you and Bill Clupper (with Marvin Burnette & Brian Pearce) had in the Winter 2003 Restorer, before I started the Thread. Thank you for the article, very interesting and informative.

This still doesn't explain the fuse "call out" in the U69 Section of the 67 AIM, except the production folks didn't have to concern themselves with it, so the AIM didn't get changed...

That would explain it, and makes good sense. I have found a few places where minor parts were changed in production and for whatever reason, the '67 AIM was not updated and no change is reflected in the Revision Record.

[Scott S.]

Re: 1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp??

MAN is it tough to read a print printed from microfilm! The '67 Radio slot was indeed labeled 10A, Circuit #43, 20 gauge yellow wire. Fuse 10 amp Red dot or stripe depending on the fuse supplier

Thanks Bill!

If I remember correctly, the 10 amp fuse is the only one that could be either a Bussmann (red band) OR a Littelfuse (red dot).

[Scott S.]

Re: 1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp??

This site on wire and current might be of some interest.http://www.powerstream.com/Wire_Size.htm

John,

Thank you for the link.

[William C.]

Re: 1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp??

Wire is 20 ga 33A circuit (pink)

[Terry M.]

Re: 1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp??

Pete,

I just read the article you and Bill Clupper (with Marvin Burnette & Brian Pearce) had in the Winter 2003 Restorer, before I started the Thread. Thank you for the article, very interesting and informative.

Scott, If that is the issue I think it is you might look at the back page for a bevy of fuse panels through the years. If memory serves the 1967 example pictured is a no radio car that just happened to be handy and on Bowtie display at a regional Meet. Back then the only color I had in The Restorer was the cover, so I had to use it for the color pictures.

BTW: You should pay attention to Bill Clupper's posts on this subject. In case you or others reading this thread are not aware his former employer was Packard Electric, and Bill was in a very unique position with them and Corvette Assembly. That is in addition to being former National Judging Chairman and NCRS President and Team Leader and a few other odd jobs with NCRS.

There Bill that is a part of the introduction I should have made in Novi. Sorry I flubbed that one, but i do sometimes cave under pressure.

[Scott S.]

Re: 1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp??

Scott, If that is the issue I think it is you might look at the back page for a bevy of fuse panels through the years. If memory serves the 1967 example pictured is a no radio car that just happened to be handy and on Bowtie display at a regional Meet. Back then the only color I had in The Restorer was the cover, so I had to use it for the color pictures.

Terry,

I tried to find it, but I don't see any back covers on the NCRS DVD of Restorer back issues.

BTW: You should pay attention to Bill Clupper's posts on this subject.

I always do. I'm here to learn

[Joe R.]

Re: 1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp??

Wire is 20 ga 33A circuit (pink)

Bill,

In an earlier post in this thread, you said 20 AWG wire, 10 amp fuse. That makes sense. Is the 33A in this post a circuit number or something? A 20 AWG wire can't safely conduct 33 A of current, or at least not for very long!

Joe

[Terry M.]

[William C.]

Re: 1967 Fuse: AIM says 106652, P&A says that's a 3 amp, but fuse block says 10 amp??

33A is the circuit number which is an internal GM ID to code what circuits were fed off that wire. The "A" indicates it is part of a multiple wire circuit (Splice) I thought I referenced it as a circuit number in my post, didn't mean to mislead, 20 ga wire is accurate. Pink as I recall, could look it up again if important.