Electrical issue

So I did the fuse box update and everything is wired in correctly. Now I had a new key made and I have no power to anything but the rear left blinker. It just stays solid. All my fuses and grounds are good. I am at a loss here. Nothing has power when it did before.

 

Also it’s a 1981 Seca 750

 

What was the state of things before the fusebox upgrade?
Was any other electrical work done by you at any time prior?
Can you post a photo of the new fusebox as it sits on the bike?

 

Voltage at main fuse? tail light on?

 

So I put stock blinkers back on, and everything lit up and worked right. But my key switch cover is busted so it’s not holding a great connection there. I couldn’t find a new one since mine has the 2 plug harness, so i ordered a used one. Waiting on that in the mail.

 

If the used one has problems, contact Chacal. He usually has most parts, even if it's not in the catalog.

 

I will be sure to contact him if need be. I think it’s most of my issues. Also my starter button doesn’t work, and my digital display just shows everything as wrong I think. Like it’s in a systems check loop. And if I try to use blinkers they just go dim and don’t do anything

 

That handy bit of info leads right to the keyswitch being at fault.

 

So i replaced the key switch and nothing changed, if I run a jump wire from back blinker to battery I get tail lights, brake lights, and turn signals stay solid when engaged. Also no headlight, gauge lights, neutral light or start button. I’m thinking a ground somewhere but no clue where to start. I noticed two grounds under tank next to coils but do nothing when grounded. I’m at a loss so far

 

those 2 grounds should be under the coil bolt harness grounds.
you need 27 or 28 watt bulbs to make stock flasher work

check to make sure battery ground goes to motor and motor has a ground wire to frame

have you replaced the fuse box could be your problem too

 

how to
Clean and lube the ignition switch

start with basic info battery positive goes to main fuse then to key switch and returns to the rest of the fuses. check fuses

headlight only comes on when motor spins or is running.

i use this to test fuse circuits clip to crimps and put proper fuse value in it

 

Prior owner to me replaced coils, and they were just zip tied up. Also I see the ground going from battery to motor, but nothing from motor to frame. Where should that go? I only have one ground to battery. And i did update fuse panel to the newer style push fuse type. When i pull fuses i get cut off at the correct circuits. I’m answering to best i can lol I’m not good at electrical

 

look for this ground strap below tci and voltage regulator just above chain box it runs to motor may be 2 of them

 

I have a XJ750 seca i don’t have a chain. Shaft drive. So I don’t know if it’ll be the same or not. And what does the coil bolt harness look like?

 

ground straps at rear of crank case

 

I see the one from battery to back of crank case, but no other sign of cranksfase to frame.

 

I connected the two eyelet ground under the tank and I have left blinker, headlight and a faint tail light. I cleaned them and the ground surface. Maybe that’s my issue?

 

it was part of your issue you also need to ground frame to motor as shown in photos

check the bullet ground connectors for signals front and back also get proper bulbs clean sockets with electric spray and use dielectric grease on all connectors you take apart they all need to be cleaned

 

I had the same problem until I cleaned the turn signals and put grease on the connectors. You wouldn’t think doing something very simple would cure a problem like that.

 

voltage drop is the enemy. each dirty connector adds to the resistance droping the voltage and conductivity. the Lead ends of the bulb dent in and lose contact. simple little things add up could even just be he needs new bulbs. I changed bulb out and blinking problem went away old bulb would light and flash when rpms were at 1500 but stop when below that. new bulb flashed with just key on.

 

You don't have a drive chain, but you do have a chain box.
what-is-this-empty-space-under-the-airbox.65769

 

I will give all these suggestions a try as soon as I am out of work. Thank you all for the great responses and answers. I will let you know my outcome

 

the 2 ring terminals (eyelets) go on the ignition coil mounting bolt that is how the wiring harness is grounded to the frame , then the frame grounded to motor with straps which completes the ground path to battery through the motor to battery wire making all your grounds connected.

terminolagy
Box (that holds)
4H7-21258-00-00

The
Wheel Lock Assembly (4X7-W2171-

4W5-W2171-00-00

 

So I have checked all connections and everything is clean and solid. My lcd lists everything as wrong. I grounded the two eyelets. I noticed that if I run a jump wire from the plug under the seat for the rear lights to the battery ground. I have all lights and flashers working properly. Where if the ground for this plug? Still no starter button or neutral light. If this info helps it’s all I got right now lol

 

neutral light could be bulb disconnected wire from neutral switch or the switch itself.
starter button may need to be cleaned in the control , have you tried pulling in the clutch when pushing starter button? if bike thinks it is in gear (bad neutral switch wire off or broken) you will have to pull in clutch as if starting in gear.

do you have voltage at the small solinoid wires? starter switch makes connection to ground.

grounding for that plug? connector is wiring harness to the ring terminals you connected to frame at ignition coil mounting bolt holes.

did you ground motor to frame yet if not that is your problem . Frame is not ground untill it is grounded to motor by a wire or to battery terminal

where on frame did you connect the ring terminals (eyelets)

 

Checked bulb in cluster it’s still good. Have tried pulling in clutch and still nothing. Can’t find a bad wire for the neutral switch. I will take apart switch tomorrow and check.

I have voltage at all the solenoid and plugs. If I unplug them the corresponding circuits cut power as far as i can tell.

I connected those two eyelet grounds to the coil mount holes. Cleaned down to bare metal and cleaned wire ends to clean metal. Good connection.

Have not grounded to frame yet. I will have to tomorrow after work and see if that help. Do i just ground it from the battery ground on the engine? Or another bolt on the motor to the frame?

Thank you for the help honestly, I do appreciate it

 

there are 2 bolts at rear of motor but you can use the battery to motor bolt I do think this will solve your problems. i will try to photo bolts that are used on maxim for the proper location.

to test neutral switch just connect meter on ohms to motor ground and other probe to neutral switch when in neutral it should conduct. skyblue wire can also be connected to ground to trigger starter safety switch

could be you have a bad clutch safety switch too check that as well or bypass it.

 

How do you by pass these switches? Any photos would be great to I’m not just guessing where to jump wires and cut plugs.

And i will let you know my outcome of the ground tomorrow after work. Any photos of what to bypass and the ground would be fantastic. Where on frame should I ground to?

You have been a great help sir

 

the clutch safety switch goes into headlight bucket there is a green connector with 2 wires just put a jumper across the 2 wires. or cut the wires at the switch and twist them together. jumper wire is best way to go, the clutch safety switch may be good.
disconnect the wire from the neutral switch and ground it with a jumper wire to the frame or negitive battery terminal light should come on . to test neutral switch connect meter to battery ground or to motor then test continuity to the neutral switch where the wire connects to it . bike in neutral then shift out of neutral and continuity should be lost.

 

motor ground to frame location just above chain box at corner where tci and voltage regulator is mounted this screw holds down the mount

 

So I put the second ground on and it hasn’t changed anything. I’ve cleaned all my connections and everything’s good and tight. All ground are connected. I turn key on and the right signals stay lit and do not blink, the tail light/plate light are dim. Left blink works but no running lights. Any ideas? And where is neutral switch located?

 

I also grounded the plug I thought was the neauteal safety. I think it might have been the clutch safety sensor. Because now my neautral light comes on and the starter button works. Still having signal and tail light issues

 

disconnect ground s on coil mount and do a continuity check to battery ground and all light grounds do ohms look for high resistance.

you could also test for voltage drop by hooking meter to plus side of battery and seeing what voltages you get at each ground point with all grounds hooked up.

now is your battery fully charged? this will affect tail/signal lights if it is low .

clutch safety switch is on the clutch lever 2 wires coming out from a switch which tend to come apart.
time to test the neutral switch.

I do think you have resolved the grounding issues . does your tail light not come on or just dim?
signals need proper voltage to flash and then there is the signal switch which may need to be cleaned and possibly a loose wire on the little board in the switch .

 

The tail light and plate light are dim, I have no running lights on left side, but directional work. I have running lights on right side but no directional. The right directional indicator is lit up on dash when key is on. All bulbs work.

I might have revolved ground issue, because now neutral light is on, but I don’t need to have clutch in to start.

And I’m not sure how to do a continuity test. I’ve just been winging it lol not very good with electrical.

I will take switch apart shortly when I’m back out near bike to see how it looks inside.

 

continuity test is usaly a buzzer on the multi meter you can just test the resistance in the ohm settings

make sure the signal and running lights are hooked to correct wires,

right directional indicator light on with out switch being pushed to right?

 

Yes Right indicator light lit without switch pushed. And all are hooked to correct wiring.