Electrical Ignition Help! By churchy (Read 5,224 times)

[churchy]

Ok so first thread, first problem, when i turn the key in the ignition to on i get no power to anywhere, lights, horn, dash, nothing. Therefore my electric start wont work! However one the engine is running (via the kicker) everything works including starter motor! I just dont know what to do about this or where to start, electrics are really not my thing!
any help would be much appreciated.

Cheers


Yamaha Jog r/MBK Mach G 03
Stage 6 Street Race 70cc
Stage 6 Pro Variator
Stage 6 Pro Rep Pipe
Home Made Truck Horn

[alleyoop]

Oct 10, 2013 17:00:47 GMT -6 churchy said:

Ok so i was on route to college, when i was stopped at a junction, when i came to pull away i noticed that all of a sudden the revs had to get very high for the ped to move even then with poor acceleration, normally it has high bottom end power and is quick off the mark, up to about 10 mph it did this then went back to normal but it kept doing this, then i pulled over to read a text leaving engine at idle and it cut out, now it just dosent work!!
there is a spark, new plug, cleaned carb with carb cleaner, fuel getting to carb and to inlet, took off cyllinder head to see if fuel got into the cylinder, it did. but the head of the piston had a few small chips in it at the edges, then i removed the piton to see that the first piston ring was in bits and the second bent, this had marked the cylinder sleve, only lightly and in one place. would this damage to the piston be enough for it not to start?

YES, to your question "WOULD THIS DAMAGE TO THE PISTON BE ENOUGH FOR IT NOT TO START"
With this problem forget about fixing the electric start.
Alleyoop

[JR]

Oct 11, 2013 10:09:21 GMT -6 churchy said:

Ok so first thread, first problem, when i turn the key in the ignition to on i get no power to anywhere, lights, horn, dash, nothing. Therefore my electric start wont work! However one the engine is running (via the kicker) everything works including starter motor! I just dont know what to do about this or where to start, electrics are really not my thing!
any help would be much appreciated.

Cheers


Yamaha Jog r/MBK Mach G 03
Stage 6 Street Race 70cc
Stage 6 Pro Variator
Stage 6 Pro Rep Pipe
Home Made Truck Horn

OK you didn't say what year this Jog is but the electrics on it are simple and typical of most scooters. From what you said it seems it will not start with the electric starter and since you said it would run with the kick starter then we know the stator, cdi, and coil are good.

This is the wiring diagram from the 91 to 97 Jog service manual:





When you turn the key on you supply power from the red wire to the brown wire and in turn the brown wire feeds both brake light switches #29 & #30 and when you press the brake handle (either one) you send power to the starter relay #11 and the brake lights #17. Then you press the start button #10 and supply ground to the starter relay. The igniton switch #7 is fed by the battery from the red wire which is fused #8.

Possible reasons it won't start electrically

Bad fuse
Bad key switch
Bad brake light switch (either one or both)
Bad start button
Dead battery
Poor grounding especially to the start button
Broke wiring or poor connection resulting in no power being sent to starting components.

While you are waiting on you new parts you can play with this to see what your issue is.

[churchy]

i did say it was an 03 reg next to make and model

[churchy]

not fuse
dont tink brake light switch as they work when running
not dead battery

how do i check key switch, grounding, or a wiring fault?

[JR]

dont tink brake light switch as they work when running

Do they work with just turning the key on and pressing either brake handle?

[churchy]

no

[tvnacman]

Have you checked the fuse with a meter ?

John

[churchy]

im confident its a good fuse but i dont see haow id be able to once its in

[JR]

Then you need to take a volt meter and see if you have 12Vdc + on the ride wire going to the key switch, if you do then turn the key on and see if you have the same 12Vdc on the brown wire, if not then it's the key switch bad. If you have no voltage on the red wire going to the key switch then you have a broke wire or bad fuse.

Oh and it's easy to check a fuse with it in the fuse holder, with your meter it should read 12Vdc + on both ends of the fuse, if not then it's bad even if it looks good and yes that happens.

JR

[alleyoop]

Looking at a fuse IS NOT GOOD ENOUGH you either TEST IT or just go and buy a new one and replace it they are CHEAP.
Alleyoop

[churchy]

alleyoop you have a serious capslock issue, ought to get it seen to

[alleyoop]

Churchy,
Sometimes it takes CAPS to have people take notice and listen. Then again even that doesn't help, and when that happens we get tired of trying to get it through some thick skulls then just give up and loose interest and let them go on their merry way and do whatever they please.

It is pretty obvious what your problem is but sorry to say you just won't listen.
Good luck
Alleyoop

[churchy]

are you joking me alleyoop you have not been helpful, 'its obvious what the problem is' i have said more than once it is not the fuse

[alleyoop]

Oct 13, 2013 12:26:16 GMT -6 JR said:

Then you need to take a volt meter and see if you have 12Vdc + on the red wire going to the key switch, if you do then turn the key on and see if you have the same 12Vdc on the brown wire, if not then it's the key switch bad. If you have no voltage on the red wire going to the key switch then you have a broke wire or bad fuse.

Oh and it's easy to check a fuse with it in the fuse holder, with your meter it should read 12Vdc + on both ends of the fuse, if not then it's bad even if it looks good and yes that happens.

JR

Did you do any of this?
Alleyoop