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  #1  
Old February 17th, 2016, 02:06 PM
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Dan Pollock
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Dumb fuse question

So I've been blowing the first fuse for the last few weeks. I also can't tell if my heat is working, as both trips have been in FRIGID weather and only 20 min or so long, so it could very well be that heat hasn't had time to warm up.

So question 1: which fuse is my heater on? and question 2, any likely culprits for this fuse blowing? Only recent electrical work has been putting in a tach and removing the clock (and the dash lights all work fine afterward despite this blown fuse).



Pardon the super sandy fuse box pic from the beach. It was the only pic I could find of my fuse panel.
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  #2  
Old February 17th, 2016, 02:28 PM
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Robert Davis
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Heater blower is the one that looks like a fan blade.
Put in a 30 or 40 amp fuse.
If that blows you have a short that may or may not be related to your recent electrical work.
If it doesn't blow, the circuit is still protected from a short with the higher amp fuse so leave well enough alone.
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Old February 17th, 2016, 02:33 PM
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Dan Pollock
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Gotcha, thanks. So i guess the heat is fine. And now that I look, the clock is on that fuse (separate from the rest of the gauges?). I used the positive and ground from the clock for my new tach. And yet the tach is working fine despite this blown fuse.

The way I wired it was:

1. + and - for the backlight split from the + and - of the speedo
2. wire from the - of the ignition coil for the revs
3. + and - from the original clock's + and - to power the gauge.

What could be up?
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Old February 17th, 2016, 02:45 PM
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That looks OK from afar, but you repurposed the clocks leads that I don't see on the fuse legend.
Unplug all that stuff and isolate it and see if the fuse blows.
If it does you know the answer you seek.
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Old February 17th, 2016, 02:53 PM
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Dan Pollock
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I think the clock is on fuse 1, no? (1 being top left, the one that's blowing)

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Old February 17th, 2016, 03:00 PM
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Quote:
Originally Posted by rdavisinva View Post
Heater blower is the one that looks like a fan blade.
Put in a 30 or 40 amp fuse.
If that blows you have a short that may or may not be related to your recent electrical work.
If it doesn't blow, the circuit is still protected from a short with the higher amp fuse so leave well enough alone.
It will just melt the wires.

What fuse is impacted is the first issue. Heater blower motors get junked up/corroded and draw too much current and then blow fuses.
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Old February 17th, 2016, 03:02 PM
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Dan Pollock
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If the heater fuse is the fan, then I think I'm good. That fuse is intact. I think I just wasn't getting heat because I didn't drive it long enough in the 15 degree weather to get the heater going.

Now just a matter of figuring out how my tach wiring is blowing that fuse.
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