Led Headlight and Taillight flashes when turn signals are on

Hi,
I've installed front and rear led Headlighht on my XJ600 1989 3KM but I'm aving problems with them.
They both flashes when indicators are on. I'm using stock flasher relay and incandescent (not led) turn signals.
New battery 12.4v

Head and Tail light are working fine when turn signals are off.
Can someone tell me how to fix it?

 

yes i had the same problem on my xj600 bobber project, you will need to fit some " blocking diodes" in circuit to stop the stray signalls, from affecting the lights , i'll have a look how i solved it, but it took me ages to figure it out, but i also had led flashers,
it is "dooable" just let me check first

 

Great. Waiting to hear from you.

 

hi again, i checked my drawings and notes, relating to what i did to rectify the above fault,
i can assure you there may be no "quick fix" to this problem,
i fitted a total of 6 blocking diodes in the various circuits, including
rear lights --(tail and brake)
headlight--- pilot light and indicators
first thing you might like to try is cleaning up the connections to all the circuits and earths
starting with the earths, there's the battery, (obviously) the engine earth at the very back of the engine , on one of the crankcase bolts.
the frame earth, which bolts underneath the battery tray
then all the component "earths" (the black wires) coming from the headlight ,tail and brake lights , and indicator earths bullet connections,

are your dashboard illumination lights also flashing ? , if so you may also have to clean up those connections as well,
i'll see if i can find some photos of what i did,

did you fit complete units for the headlight and tail light ,or just led bulbs?

 

Did the original incandescent headlight and tail light work properly before or is that unknown? When you say they blink, do you mean a change in brightness (i.e. dims when the signals flash) or do they turn off/on/off/on in reverse of the signals?

Does the bike have a single turn indicator or is there one for each direction?

 

his bike has an indicator light for each direction, unless he's altered it.
while were waiting for him to get back, heres some photos of the diode installation.

first start with unplugging lights ,except the tail light, so unplug headlight, pilot light, and dash illumination lights, and just focus on getting the tail lights, working ok.

here are the little blighters you may need to fit in circuit, availlable on ebay quite cheaply


i got these from a very old battery charger, they should have much longer leads on them though
the silver end is the blocking end , and should face towards the current you are trying to block.
in this case you are trying to block stray signalls comming up the earth (black) wires


before cutting any wires , temporarily fit the diode into a connector block , with some extention wires to see if that solves the problem

 

Hi guys. I fixed the issue. It was bad ground - or really no ground issue. The light related stuff - headlight/ flashlight and even tci had no direct ground to battery/frame. It did got a little bit of ground (high resistance, I got 10.6v when testing between headlight positive and ground in h4 bulb socket, but when I probed headlight positive with battery ground i got 12.4) from relay module - 2uj 8195. It was somehow leaking ground or something, after replacing it with new one from tdm 850 (same part#) i got no ground and then I started looking around how ground on wire loom connects to frame or battery ground. It did not .
And that's because I switched from old rectifier to CBR style one that did not had any ground to frame. I spliced ground fire coming to rectifier and added new ground wire that I connected to frame. Now I'm getting 12.4v on headl8ghts, no dimming when flasher is on and even spark came back to both coils.

If I did something bad like the ground should not be connected to frame please tell me.

Or different question. How and where wire loom connects to frame/battery ground?

 

no thats fine, but the CBR rectifiers usually have 5 pins, your original rectifier has 4, the spare pin on the CBR rectifier, is the earth, that pin will also need to be earthed in order for the system to charge.
is there an earth wire connected to the frame, underneath the battery box ,on one of the lower mounting bolts, that one is also a frame earth

 

Hi. Originally there was 4 pin connector (3x white, one red) and one black ground eyelet connector. I chopped all 5 wires and connected them to rectifier. I never had original rectifier. I assume the eyelet connector should be originally connected to frame - right? If this is true it's beyond me how this bike runed before I developed problems with headlight and spark.
Under battery there is eyelet connector that connects from frame to engine and then loops to battery but is not connected to wire loom - it looks stock.

 

yes that is all correct, glad you found the cause

 

Thank you all for helping with my bike