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Shes Dead!

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sean1381

Shes Dead!

Hello Everybody! i have just joined the site and this is my first posting. i hav just picked up what i thought was a great find 1979 750f. the guy i bought it off of said, " it ran when i parked it 10 years ago!" so i immeaditly think, great! clean the carbs and ill be good to go! not so unfortunatly. i brought her home, hooked up the battery, turned the key on, and........ nothing! no lights (although the headlight is missing. could this be why?), no horn, wont crank. shes dead. i am not fimilar with cdi bikes, only points, so i run a hot wire to the + sides of both coils and jumped the starter. nothing. ive checked all the fuses and all the grounds i can find. i really dont know where to go from here. any knowledgable information would be greatly appreciated. i really dont want to send her to the bone yard! :( can someone PLEASE help us!!!?????

Re-run

Re: Shes Dead!

Administrator

I don't know the dohc bikes much but you do have the manual right? And the wiring diagram?

The ride IS the adventure. The destination is just to get gas!

icerigger

Re: Shes Dead!

In reply to this post by sean1381

Is that the battery that came with the bike? If so, chances are it's pooched.

The first thing you need to do is to make sure your battery is good. Buy, beg or borrow a charger and charge the battery and take it off the charger and measure the voltage. Let it sit overnight. If the voltage in the morning is more than half a volt lower, you need a new one.

Livin' my life like a song.

1985 Honda Rebel 250 - "Birdie"
1979 CB750K - "Behemoth"

TOOLS1

Re: Shes Dead!

Administrator

In reply to this post by sean1381

You can download the manual for free from the thread at the top of the homepage here.
TOOLS

Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
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"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)

sean1381

Re: Shes Dead!

In reply to this post by icerigger

it is a new battery. fully charged.

sean1381

Re: Shes Dead!

In reply to this post by Re-run

i have downloaded the wiring diagram but not the manual yet.

icerigger

Re: Shes Dead!

In reply to this post by sean1381

Take your multimeter and wiring diagram and work out from the battery starting at the main fuse. Inspect the main fuse block too, sometimes they corrode on the back. You say you jumped the battery directly to the starter and nothing. Did the starter turn over, spin or click at all?

Livin' my life like a song.

1985 Honda Rebel 250 - "Birdie"
1979 CB750K - "Behemoth"

shinyribs

Re: Shes Dead!

Administrator

How much of "the headlight" is missing? Almost every electrical connection on the whole bike is made inside the headlight bucket. If it's just the lens missing,well...but if it's the entire headlight,you may have a bit of a job on your hands.

shinyribs

Re: Shes Dead!

Administrator

Oh yeah, and check out the main fuse. It's actually just a strip of metal. It's behind the side cover on the left hand side of the bike. It's inside a square,black box. There is a wiring harness connector that feeds in to the top of that box. That connectors is what keeps the box closed. If the sticker is still present it will be easy to spot. If not you'd never guess there is anything in there. If that fuse/metal strip goes ka-put it will kill the whole bike like you describe.

It's the one on the left.

sean1381

Re: Shes Dead!

so iv solved my issue! bad ignition switch. i chased it with my multimeter and found voltage going in but none coming out. crossed the red and black wires and bingo! time for a new switch. thanks all for your input!!