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MarkT Exhaust
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Author Topic: Honda Magna: No juice  (Read 1692 times)
fiddle mike
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« on: March 16, 2013, 08:58:03 AM »

1999 VF750-C

Wife was warming up the engine when she lost all electric power. 

There is no power to the headlight, meters, etc.  Battery reads  12.5V, jumping with a newly charged battery has no effect.  I can jump the solenoid and spin the starter.  The 10A and 15A fuses appear to be good.  Jumping the negative post to the frame has no effect.

What am I missing?

Thnx
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Mr.BubblesVRCCDS0008
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Huffman, Texas close to Houston


« Reply #1 on: March 16, 2013, 10:10:14 AM »

Ignition switch maybe. I don't think the bank angle switch would keep the lights from coming on.
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CajunRider
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Broussard, LA


« Reply #2 on: March 16, 2013, 11:21:52 AM »

I'm not sure how the 750s were wired... but I'd say a good starting point would be to check ALL "safety" devices as a way to simply rule them out. 

This includes run/stop switch, side stand switch, clutch switch, gear indication (or neutral switch), tip-over switch, and whatever else I may be missing. 

Most of these are unlikely... but I like to rule out simple things, no matter how unlikely, before I REALLY start tearing things apart. 

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R J
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DS-0009 ...... # 173

Des Moines, IA


« Reply #3 on: March 16, 2013, 11:41:59 AM »

Do you have it in gear?

That is the 1st thing I'd check.

Keep us posted on what ya find.

If it won't start with a jumper battery, 1 of your safety switches is on or failed.

Like the kill switch, kick stand down in gear, and etc.
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fiddle mike
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« Reply #4 on: March 16, 2013, 11:42:37 AM »

I'm not sure how the 750s were wired... but I'd say a good starting point would be to check ALL "safety" devices as a way to simply rule them out. 
 

The kill switches are the same as on the Valk, they don't kill the electrics, just disable the starter.  But, yeah, I jiggled the handles  on the switch box  and side stand.  My guru told me to go for the simplest, cheapest fix, first. I'm beginning to suspect the starter button switch, but I like to bounce symptoms off the  Tech Board before I start turning bolts and cutting wires.
.
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salty1
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"Flyka"

Spokane, WA or Tucson, AZ


« Reply #5 on: March 16, 2013, 12:20:40 PM »

I could believe it's the starter switch or kill button, something probably just dirty.  Undecided
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fiddle mike
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Corpus Christi, TX


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« Reply #6 on: March 16, 2013, 12:46:09 PM »

I could believe it's the starter switch or kill button, something probably just dirty.  Undecided

I found the 30A main fuse...  Bad
I don't know why it would burn, though.
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R J
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DS-0009 ...... # 173

Des Moines, IA


« Reply #7 on: March 16, 2013, 01:36:10 PM »

Glad ya found it.     Just a precaution, I'd carry a spare 30A fuse in the bike.

Especially since you don't know why it blew.

Have you added anything electrical to the bike recently?
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fiddle mike
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« Reply #8 on: March 16, 2013, 02:11:20 PM »

Glad ya found it.     Just a precaution, I'd carry a spare 30A fuse in the bike.

Especially since you don't know why it blew.

Have you added anything electrical to the bike recently?

No, RJ, the last electrical thing I added was a voltage regulator, which I relocated so it would cool better.  That was a couple of years ago.  I'll be testing the unit once get the battery back in.  But first:  taco break.  Wink


.
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gordonv
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Richmond BC


« Reply #9 on: March 16, 2013, 02:25:10 PM »

Not too familiar with the Magna, was it the T-bone style fuse?

If so, consider changing it to a bladed fuse instead. Easier to get the fuses and to swap out if looking for a problem.
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fiddle mike
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« Reply #10 on: March 16, 2013, 02:32:45 PM »

Not too familiar with the Magna, was it the T-bone style fuse?

If so, consider changing it to a bladed fuse instead. Easier to get the fuses and to swap out if looking for a problem.

The '99 has blades, the big ones. Yeah, they are less of a p.i.t.a.
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sandy
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Mesa, AZ.


« Reply #11 on: March 16, 2013, 02:41:07 PM »

Fuses tend to weaken with age. Add vibrations and a fuse can pop with no good reason.
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fiddle mike
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« Reply #12 on: March 16, 2013, 03:04:04 PM »

Fuses tend to weaken with age. Add vibrations and a fuse can pop with no good reason.

Hold that thought!    cooldude
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