1970 30 Amp Pwr Window Circuit Breaker ??

[Clark E.]

I'm this step away from turning the key on a 3+ year frame off restoration on my '70 roadster 350/300 4 speed w/ air. The issue is a separate 30 amp/12 volt fuse that has two long threaded screw posts with one marked BAT and the other AUX. This is an original fuse that is mounted on a metal bracket with two holes for screws to hold it to what I think is the upper firewall. The front of the fuse is dark brown plastic but does not have a part number. I like to know what wire (color and function) connects to each post and where the fuse mounts on the car. I can't find the fuse in the AIM and 3 years has erased my memory of what this fuse does and where it mounts. Thanks guys...Clark

[Joe L.]

Re: 1970 30 Amp Fuse??

I'm this step away from turning the key on a 3+ year frame off restoration on my '70 roadster 350/300 4 speed w/ air. The issue is a separate 30 amp/12 volt fuse that has two long threaded screw posts with one marked BAT and the other AUX. This is an original fuse that is mounted on a metal bracket with two holes for screws to hold it to what I think is the upper firewall. The front of the fuse is dark brown plastic but does not have a part number. I like to know what wire (color and function) connects to each post and where the fuse mounts on the car. I can't find the fuse in the AIM and 3 years has erased my memory of what this fuse does and where it mounts. Thanks guys...Clark

Clark-------


If it's an original installation, I believe it's the A/C fuse. If so, the wires should connect to the A/C relay on one end and the horn relay on the other.

[Dick W.]

Re: 1970 30 Amp Fuse??

I'm this step away from turning the key on a 3+ year frame off restoration on my '70 roadster 350/300 4 speed w/ air. The issue is a separate 30 amp/12 volt fuse that has two long threaded screw posts with one marked BAT and the other AUX. This is an original fuse that is mounted on a metal bracket with two holes for screws to hold it to what I think is the upper firewall. The front of the fuse is dark brown plastic but does not have a part number. I like to know what wire (color and function) connects to each post and where the fuse mounts on the car. I can't find the fuse in the AIM and 3 years has erased my memory of what this fuse does and where it mounts. Thanks guys...Clark

Believe if you got to the C60 section in the ask my manual it will give you directions

[Clark E.]

Re: 1970 30 Amp Fuse??

Thanks Dick. I'm not familiar with the "ask my manual" process. Are you referring to another manual other than the AIM? I did page through the C60 section of the AIM before posting but didn't see any information on this fuse. I could have overlooked it. Is the process in another document?

[Alan S.]

Re: 1970 30 Amp Fuse??

Hi Clark,
I believe the fuse is shown in the AIM in the C60 option pages on sheet E4 (In my 71 AIM). It's part of the the View B Diagram.
It's indicated as: "FUSE HOLDER & FUSE (Part of A/C Harness Assembly)".
There's a Note: "Route wire along Engine Wire Harness & Gen & Fwd Lamp Harness & connect to "Battery" terminal on horn relay".
I think that may be what you're asking about?!?
The Sheet is Titled: Air Conditioning-Front Vacuum Hoses & WSWA Reservoir. Hopefully your 70 AIM has a similarly titled sheet.
The fuse is also shown in the A/C Wiring Diagram, Sheet E6.
Regards,
Alan

[Clark E.]

Re: 1970 30 Amp Fuse??

Thanks Alan...I left my AIM copy with the car yesterday and now am heading to the offsite garage this morning to retrieve the information. Does the AIM indicate where on the firewall the fuse attaches?...Clark

[Alan S.]

Re: 1970 30 Amp Fuse??

Hi Clark,
Well that question concerns me…the fuse I'm looking at mounts at the horn relay which is on the driver's side fender apron.
Is it possible that that's where the fuse you're asking about is located too?
Since my car doesn't have A/C I'm not familiar with the details as I'd like to be.
Sorry!
Regards,
Alan

[Jim T.]

Re: 1970 30 Amp Fuse??

Clark my 1970 was built in July and I bought it in August 1970. The high speed blower fuse on my 70 is located in the engine compartment but is much different from what you describe. The fuse is located in what I describe as only a plastic fuse holder that encloses the fuse with wiring connected to each end. To change the fuse or remove it just twist one end of the plastic fuse holder while holding the rest and it comes apart. The fuse holder itself is not mounted to anything, just connected by the wiring.

[Terry M.]

Re: 1970 30 Amp Fuse??

Clark my 1970 was built in July and I bought it in August 1970. The high speed blower fuse on my 70 is located in the engine compartment but is much different from what you describe. The fuse is located in what I describe as only a plastic fuse holder with wiring at each end that encloses the fuse. To change the fuse or remove it just twist one end of the plastic fuse holder while holding the rest and it comes apart. The fuse holder itself is not mounted to anything, just connected by the wiring.

Jim,
In the electrical business what you describe is known as an "in-line" fuse. I can't picture the device the OP is asking about as OEM, but a photo might make the light bulb go on.

Didn't Power Windows have a circuit breaker mounted on the firewall that looks like what the OP is describing?

[Alan S.]

Re: 1970 30 Amp Fuse??

Hi Terry,
I think you may be right.
The power window 'breaker assembly' was fastened to the firewall just to the right of the mounting location for the master cylinder or p/b booster. The p/w harness comes through the fire wall and has two wires that connect to the two studs on the breaker and a third wire that continues on to the horn relay.
The 'in-line' fuse for the a/c I was describing certainly isn't in that area… its at the horn relay too.
Regards,
Alan

[John H.]

Re: 1970 30 Amp Fuse??

It's not a "fuse" - it's a self-resetting thermal circuit breaker, like the ones used for the midyear headlight bucket motor circuit and the '67 power window circuit.

[Bill L.]

Re: 1970 30 Amp Fuse??

It's not a "fuse" - it's a self-resetting thermal circuit breaker, like the ones used for the midyear headlight bucket motor circuit and the '67 power window circuit.

What he said. My 70 with P/W has the circuit beaker exactly as described and is located exactly where Alan described. The AIM also clearly shows the connections and location.

I never attempted to start my 70 without the breaker hooked up. My concern would be the HOT wire and that it might accidentally ground out and cause a big problem and in worst case a fire. If you are going to attempt to start it without the breaker connected make sure there is no chance of the HOT wire grounding out.

Bill

[Jeffrey S.]

Re: 1970 30 Amp Fuse??

Carl
If yours is the same as pictured from my '69, it is the power window circuit breaker. There are 3 wires attached to mine: a tan wire at the top termional and a red and a yellowish wire at the other terminal. Hope this helps.
Jeff

[Alan S.]

[Clark E.]

Re: 1970 30 Amp Fuse??

Many thanks Alan...I have certainly benefited from your knowledge and insight over the last 3 + years since I first started this restoration. I'm very pleased to report that today we turned the key and "Houston we have ignition"! Still lots to do as you are probably well aware but this is huge!

Actually, I believe this fuse is part of the A/C system. I did find the C 60 page E-4 option sheet and the inline fuse off the horn relay that appears in the drawing is present on my car but isn't the fuse I'm having difficulty identifying. Again, my sincere thanks and don't worry, I'll have a ton of questions going forward...Clark