Need electrical help

91 vfr750.
Having a starting /electric issue and I left my info at work. Can anyone walk me thru testing on this? Have a new battery that has a good charge. Turn the key any no power to any thing. Started to test the wire then thought I better not waste my time without the info in front of me. I hate electrical. Went as far as the starter and got confused because I had no positive charge at the starter connection but I did have negative charge???

Any help would be appreciated, either a walk through or a pic of the wiring diagram if anyone has it handy. Can't do anything adobe with this dumb iPad......

Thanks guys!a

 

Check your main power fuse.

 

Sorry, forgot to mention I already pulled apart every connection I could find and clean. Also checked and tested every fuse I could find. Checked the 30 amp at the battery and the fuse box at the right side fairing. All of them tested good

 

So you're saying that all the fuses are good but when you turn the keyswitch to the "On" position nothing at all powers up?

 

That's correct, turn the key and nothing powers up

 

Alright then follow the wiring from the keyswitch back to the electrical connector plug that plugs into the main wiring harness and disconnect it. Visually check to see if any of the wire terminals on both sides of that plug connector are burnt or corroded. Also keep an eye out for any frayed or broken wires.

If all your fuses are good and nothing powers up when the keyswitch is turned on then possibly you aren't getting power across that electrical connector plug or your keyswitch itself may be faulty.

Also double check all your battery power and ground connections. Make sure they are clean and tight.

 

Thanks stoshmonster. I'll check it as soon as I get the burgers cooked":biggrin:

 

Cool. Let me know what you find.

 

Yes, as Stosh mentioned, you need to pull apart the multi-pin connector between the ignition switch and wiring harness and test for continuity with key on between two terminals according to the wiring diagram and the service manual. Also inspect connections on top of starter relay for melting or discoloration.

You should also test for any resistance between the negative battery terminal and a chassis ground, which should be zero.

 

ok, pulled apart the connector at the main wiring harness and it was a little dirty, but there was quite a bit of water in there. guess i got carried away cleaning it up earlier. drained the water, used the contact cleaner, lightly sanded the pins to get the crud off, more contact cleaner. it looked clean, so sprayed some more cleaner to be sure. Let it dry out overnite then checked the key this morning, still nothing. Going to check all squirrelman's suggestions and try again. did i mention i hate electrical? :chaingun:

 

Okay Hamster,coupla very simple tests for you,get out your test light and locate that keyswitch electrical connector in the main wire harness once again.

With the keyswitch in the "OFF" position and that electrical connector connected I want you to test for power on the Red wire on both sides of that connector. (Just slide the test light probe between the wire and the plastic connector and touch the wire terminal.)
There should be power on that Red wire on both sides of that connector.

Next I want you to turn the keyswitch to the "ON" position,leave the electrical connector connected,and test for power on the Red wire with a Black stripe on both sides of that connector.
With the keyswitch in the "ON" position there should be power on that Red wire with a Black stripe on both sides of that connector.

What are your test results?

 

Ok. Red wire with the key off - got a light on both sides of. The connector with my ttester.
Red/black wire with the key on - no light on either side of connector with my tester.
This sounds like I need to visit service honda's website soon for a key switch assembly??

 

Yep. Your keyswitch is definitely causing the problem.

 

It's easy to break down the keyswitch into two parts: mechanical (top) and electrical (bottom).

I'd suggest you inspect the contacts for damage or corrosion, clean lightly with sandpaper and try again.

 

Squirrel - broke it down. It actually didn't look too bad, but there was a lot of "play" in the cylinder. Don't know if I'm explaining that in a way that makes any sense? Anyway, I did attempt the clean and try again just cause. Didn't work. Not the end of the world if the new one takes care of the problem. One of the tabs that holds the black cover sleeve was broken, cylinder wiggling and edges of the key slot were a little bent so all in all a new one isn't a bad idea in my opinion. Can't thank you guys enough. I'll let you know if the new keyswitch gets me power!!!! thanks guys.

 

No probs my friend,happy to help. :high5:

 

Key switch isn't necessarily required to get power to the system to test things out: just connect the power leads (usually red and brown) together in the wiring harness plug to the ignition switch. One jumper wire. Consult a wiring diagram for your bike.

 

Thanks for the tip squirrelman. I'll keep that one on file if I get stir-crazy. This is a project bike for me so I am trying to stay patient and just walk through the problems one at a time that way I can keep track of when/where the fit hits the shan. Still need to do a lot before its road ready. Once I can sort through the electrical it will be a fun project. Going to do the r/r replacement and the vfrness regardless of how they test out so I don't have trouble down the road.

 

Bet its the R/R.

 

You got that right !! It's responsible for flat tires, running out of petrol, everything electrical, skin rashes and E.D.