From: none@none.com99   
      
   On 5/22/2025 2:02 PM, Carl Ijames wrote:   
   > On Wed May 21 21:08:57 2025 Snag  wrote:   
   >>    While on a familiarization trip thru my downloaded owner/operator   
   >> manual for the antique Yanmar YM1500D tractor I just bought (mfd   
   >> 1975-79) I saw a fuse box ... so I decided to go exploring ! And I found   
   >> that fuse box , and I popped  the cover off , and I found ... fuse wires   
   >> on screw terminals ! OK , it ain't exactly state of the art , but it   
   >> fills the need . I also found tucked in the cover a small plastic   
   >> package of what I assume to be fuse wires . What I don't know is what   
   >> the amperage rating of these wires is - I'm hoping one of you might have   
   >> an idea  . Eventually I will replace this fuse box with a unit that has   
   >> plug in fuses , but for right now I'm going to clean up the original and   
   >> see if I can get the lights/horn/turnsigs working .   
   >>     I have been bitten by The Tractorbug . And it feels great . I gotta   
   >> get this one running well so I can do some much-needed and well-deserved   
   >> repairs/maintenance to Rusty , a 1982 JD 317 . He's been a great little   
   >> tractor , but he just doesn't have the (m)ass to get the needed traction   
   >> . This new tractor will be able to drag logs out of the woods that would   
   >> just laugh at Rusty spinnin' his wheels futilely .   
   >> --   
   >> Snag   
   >> We live in a time where intelligent people   
   >> are being silenced so that   
   >> stupid people won't be offended.   
   >   
   > The GM factory service manual for my 86 Regal says that fusible links are   
   four wire gauges smaller than the wire they are to protect, and MUST be   
   shorter than 9".  So if you have a circuit wired with 12 ga wire you would use   
   a piece of 16 ga wire    
   shorter than 9" as a fusible link to protect that circuit.  Here's their   
   discussion:   
   >   
   > "Fusible Links   
   > I n addition t o circuit breakers and fuses,   
   > some circuits use fusible links t o protect the   
   > wiring. Like fuses, fusible links are "one time "   
   > protection devices that will melt and create an   
   > open circuit (see Figure 3).   
   > Not all fusible link open circuits can be   
   > detected by observation. Always inspect that   
   > there is Battery voltage past the fusible link to   
   > verify continuity.   
   > Fusible links are used instead of a fuse in   
   > wiring circuits t h a t are not normally fused,   
   > such as the ignition circuit. Each fus'ibke link is   
   > four wire - gauge sizes smaller than the cable it   
   > is designed t o protect. Links are marked on the   
   > insulation with wire - gauge size because the   
   > heavy insulation makes the link appear t o be a   
   > heavier gauge than i t actually is. The same   
   > wire size fusible link must be used when replac -   
   > ing a blown fusible link.   
   > Fusible links are available with two types of   
   > insulation: Hypalon'"' and SiliconelGXL (SILI   
   > GXL). Service fusible links made with SILl   
   > GXL may be used to replace either Hypalon "   
   > or SILlGXL fusible links. Service fusible links   
   > made with Hypalon " ' may only be used t o   
   > replace Hypalon'"' fusible links. To determine   
   > the fusible link type: nick the insulation of the   
   > blown fusible link with a knife. SILlCXL will   
   > have a white inner core under the outer color.   
   > Hypalon " ' insulation is one color. Service fusi -   
   > ble links are available in many lengths. Choose   
   > the shortest length that is suitable. If the fusi -   
   > ble link is to be cut from a spool, N E V E R make   
   > a fusible link longer than 228 mm (9 in).   
   > CAUTION: Fusible links cut longer than   
   > 228 m'm (9 in) will not provide sufficient   
   > overload protection.   
   > To replace a damaged fusible link, cut i t off   
   > beyond the splice. Replace with a repair link.   
   > When connecting t h e repair link, strip wire   
   > and use staking - type pliers to crimp the splice   
   > securely in two places (see Figure 4). For more   
   > details on splicing procedures see Splicing   
   > Copper Wire."   
   >   
   > Hope that helps.   
   > Carl   
      
   Speaking of oddities.  A fairly common line of fire alarm panels have   
   (had?) a fusible trace on the back of the circuit board.  The most   
   common cause of that trace blowing was somebody trying to save some   
   money and change out the backup batteries themselves only to momentarily   
   hook them up backwards.  Its the only line of control panel I know of   
   that uses the trace.  If I was a douche bag I could have charged them   
   for a new control panel and all the associated labor, but usually I just   
   left the control on my back work bench for 20 minutes while I went in   
   the office to think about.  When I would get back to it some how it   
   would exchanged out by the alarm panel fairy to a panel with a pigtail   
   fuse holder soldered on in where the fusible trace used to be.  Nobody   
   in my shop would modify a fire alarm panel, so it can only be explained   
   by magic fairies.  Kinda like the tooth fairy, but for an exponential   
   increase in value.   
      
   Most/all other panels use a serviceable fuse or just shut down until the   
   fault is corrected.   
      
   I do recall a burglar alarm panel that had a soldered on main power   
   glass fuse, but I don't recall it ever blowing out.   
      
      
      
   --   
   Bob La Londe   
   CNC Molds N Stuff   
      
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