12 volt conversion

[5 Forward]

In the process of wiring for 12 volts where would you put a fuses or fuses. The tractor is an early 640 and has been converted to 12 volts. I just want to clean up some the old wiring. I have read several articles on the conversion and no one mention fuses. I would thing it would be a good idea to put a fuse in the system. Would appreciate any advice.

 

[Michaels Dad]

I've got a 640, previous owner did the conversion, no fuses anywhere, don't know where one would go anyway unless maybe you have lights and just want one.

 

[5 Forward]

The present wiring does not have a fuse. Maybe just being to cautious. Thanks for the info.

 

[Ultradog MN]

I wouldnt over think this.
Fuse on the lights maaaybe.
Used to be you could buy a light switch with a space for a fuse right on it.
Probably could still find one.
The rest?
You only have 3 other circuits on the whole system. Charging, starting and ignition.
I don't see much need for a fuse on those.

 

[wore out]

(quoted from post at 15:45:21 06/21/20) In the process of wiring for 12 volts where would you put a fuses or fuses. The tractor is an early 640 and has been converted to 12 volts. I just want to clean up some the old wiring. I have read several articles on the conversion and no one mention fuses. I would thing it would be a good idea to put a fuse in the system. Would appreciate any advice.

You could install a short length of "fusible link wire" where the electrical system meets the battery cable.

This could prevent a fire in case of damaged/shorted wiring or a failed generator or alternator.

Any autoparts store should have various ratings of replacement fusible links.

"Are there any general guidelines for choosing a suitable fusible link?
Typically, a given harness segment is protected by fusible link that is four gauge numbers smaller. A 14-gauge wire would be protected by an 18-gauge fusible link. A 6-gauge wire would be protected by a 10-gauge link, and so on. Odd number wire gauge sizes like 19, 15, 13 and 11 are counted when sizing a link. The length of a fusible link should not exceed 9"."

Source: https://www.whiteproducts.com/fusible-faqs.shtml.

Or, GOOGLE "sizing fusible link wire".

 

[Tim PloughNman Daley]

"...no one mention fuses..." Gee, that should tell you something there - NO FUSE REQUIRED. A light switch requires a fuse and that's it. Get your wiring verified first (see below), then get distributor points set, timing set correctly with a timing light -you don't say if NAA/600 or an 800 but timing is different. 99% of all non-starting issues are due to mucked up wiring regardless if they are 6V/POS GRN or a 12V switch out job. Many don't understand how and why the 6V system works. The Essential Manuals have the OEM wiring diagrams for reference and JMOR’s Pictograms show all the correct ways to wire either 6V or 12V. Search for "WIRING PICTOGRAMS by JMOR" - it is the best electrical diagram for both the 6V and 12V setups on Ford N's.

FORD 600/800 TRACTOR IGNITION TIMING & ELECTRICAL WIRING: