List of fuses

[Tom Sinclair]

I can't find a list of 356 fuses w/amperages--anywhere. Anyone have a resource?

Thanks
Tom

[John Weyand]

The Driver's Manual for the C on page 94 lists the fuses by number and gives the amperage for each for either 6 or 12 volts. If you don't have the manual just ask and I'll post the list from the book.

[John Weyand]

Oops, The list in the manual is just for 6 volt systems.

[John Weyand]

Here's a "copy" from the manual

[Tom Sinclair]

Thanks! I don't have the owners manual, and someone many moons ago took the car apart. Can't quite make out the amperage(s) on the picture, mind trying again?

Tom

[John Weyand]

Tom, The print is so small, it'll be easier to just list them.
Fuse # 12 25/40
Fuse # 11 25/40
Fuse # 10 25/40
Fuse # 9 25/40
Fuse # 8 8/15
Fuse # 7 8/15
Fuse # 6 8/15
Fuse # 5 8/15
Fuse # 4 8/15
Fuse # 3 25/40
Fuse # 2 25/40
Fuse # 1 8/15

[Tom Sinclair]

Thanks for that!

Tom

[Mike Smith]

Tom,

The Drivers Handbook is a very useful Tool that no 356 owner should be without

$65 from your Goodie Store

[Cliff Hanson]

Tom, The print is so small, it'll be easier to just list them.
Fuse # 12 25/40
Fuse # 11 25/40
Fuse # 10 25/40
Fuse # 9 25/40
Fuse # 8 8/15
Fuse # 7 8/15
Fuse # 6 8/15
Fuse # 5 8/15
Fuse # 4 8/15
Fuse # 3 25/40
Fuse # 2 25/40
Fuse # 1 8/15

In addition the maintenance manual calls for a 2 amp in-line fuse for the radio.

I don't understand the dual rating on the fuses? What is that for?

[John Weyand]

When I saw that in the book, I assumed it was for 6 or 12 volt application. In the "Technical and Restoration Guide" (at p 103) Pat Ertel says he used 15 amp for all positions in his 6 to 12 volt conversion. But in Vol 2 or the "Guide", Paul Goldzung said he used 8 amp for all in his 12 volt conversion. I think I just put 15 amp fuses in the positions that called for heavier fuses and 8 amp in all the rest.

[Cliff Hanson]

Originally the fuses were for 6v cars, so I still don't know what the double rating was for. Maybe continuous and short duration rating? The voltage should not make any difference as it is current that would determine when the fuse would blow, right?

[John Weyand]

Light bulb usage is easiest to explain. A bulb is listed in watts--for example 10 w.
At 6 Volts the amp draw is twice the amp draw of 12 volt. The formula is Amp=Watt/Volt

So 10 watt/6 volt= 1.66 amp
or 10 watt/12 volt=.83 amp
At 12 volt the amp draw for the same watt usage is 1/2 or the 6 volt.

[Cliff Hanson]

Light bulb usage is easiest to explain. A bulb is listed in watts--for example 10 w.
At 6 Volts the amp draw is twice the amp draw of 12 volt. The formula is Amp=Watt/Volt

So 10 watt/6 volt= 1.66 amp
or 10 watt/12 volt=.83 amp
At 12 volt the amp draw for the same watt usage is 1/2 or the 6 volt.

I understand the power rating in wattage of light bulbs and the voltage/current relationship, but I don't think that is the same thing as the current rating for a fuse. The fuses for our cars are a GBC ceramic German automotive fast acting fuse from what I can determine and come in 4 colors: yellow, white, red and blue with 5/8/16/25 amp rating, respectively.

But the dual "rating" shown in the factory C wiring diagram and on Joe Leoni's electronics schematics as well as other schematics sold show the only two fuses used are 8/15 and 25/40 amp fuses. There is a note saying that on 12v systems that all fuses are 8/15 amp. I don't think that the system voltage has anything to do with the fuse rating other that there is less current flow to loads like the headlights so you can use a smaller size fuse. The fuse will fail (or blow) at the stated current capacity whether in a 6v or 12v system.

The fuse itself has only the lower number on it, so this still begs the question, what is the dual "rating" for, 25/40 for example on the blue fuse? I still wonder if the higher number is not the current it would take to fail the fuse in a very short time such as would happen with a dead short on the protected wire. This short term current would not heat up the wire and insulation long enough to damage it compared to a lower continuous current.

[Wes Bender]

"I don't think that the system voltage has anything to do with the fuse rating other that there is less current flow to loads like the headlights so you can use a smaller size fuse. The fuse will fail (or blow) at the stated current capacity whether in a 6v or 12v system."

You're correct that the stated amperage will blow the fuse whether it is 6 or 12 volt, however as John states, the amperage for a given load in a 12 volt system will be half that of a 6 volt system, hence the 12 volt system only needs 8 amp fuses for all. It's stated that way in the owner's manual for my C.

Wes

[Cliff Hanson]

You're correct that the stated amperage will blow the fuse whether it is 6 or 12 volt, however as John states, the amperage for a given load in a 12 volt system will be half that of a 6 volt system, hence the 12 volt system only needs 8 amp fuses for all. It's stated that way in the owner's manual for my C.

Wes

I understand that. You can always use a smaller size fuse but never a larger than intended as the fuse is there to protect the wire.

But no one has an answer as to why the manual and schematics show the dual rating, 25/40 amp for example. The fuse only has 25 shown on it. I think that is the continuous load rating.