Author Topic: Power  (Read 438 times)

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Offline steve

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« on: November 28, 2020, 11:28:38 am »
Working on a 1976 CB750A

With the black & white wire from the on off switch to the coils unplugged from each other, should the coil side show ground? 
I am doing a complete rebuild and the switch side is working correctly, but the power to ground causes the fuse to blow.

Any help is appreciated.

Offline Newcb750aguy

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Re: Power
« Reply #1 on: November 28, 2020, 04:10:27 pm »
I just recently put a new full harness in the 77 I'm trying to put back on the road.
I can tell you when was taking the old harness out, there was over 10 places I counted where the
Wire coatings were gone and the copper wires were touching.
Had I put a battery in it, the harness probably would have fried.
Most of the connectors were brittle and crumbled as well.
So it's possible it's grounding a hot wire somewhere as well.

I had to undo a bolt on my coils to remove a ground wire that has an eyelet on it from the harness.
Not certain without looking back at the schematic, but I think the coils ground to the frame where they
mount Under the center frame under the fuel tank

I would look up the wiring from the fuse In the schematic and see what it feeds power to.
There is wiring schematics directly above your post in this section with the manuals.
A ton of info there

Online Don R

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Re: Power
« Reply #2 on: December 08, 2020, 04:30:07 pm »
 When the points are closed the low voltage side will be grounded. The high voltage side normally has a lot of resistance between the two plug wires. The low voltage side is around 5 ohms.
No matter how many times you paint over a shadow, it's still there.