Led front headlight goes off when revved

[savage sausage]

Ive wired up a new led bulb directly to the reg/rec it powers on when idling with a slight flicker, but when the engine is put under load it goes out.

What have i wired up wrong

[(F5)]

Try put a large capacitor as a faux battery, say 1000uf or ideally more and 25v rated. Or hook up to a battery to check. Regulation can go screwy if it sees an open.

[savage sausage]

Thanks for the reply
In short the 2 wires from external genetator are wired directly into a new Reg/Rec , and the headlight wired up directly to R/R (no switches wired in yet)

so where do i put the capacitor?

[Leo]

Originally Posted by savage sausage

so where do i put the capacitor?

after reg/rec

[savage sausage]

Originally Posted by Leo

after reg/rec

So that would be on the actual wire for the bulb +
correct?

Is a bigger uf capacitor better ? 2000/ 4000/ 10,000
buyong one is no problem just want to by the right one the 1st time

[(F5)]

2200uf 25v will be fine, and what I've used in similar setups.. A 16v will be too close to the line but would be OK for a test. They will be polarised so + to + power.

[savage sausage]

Originally Posted by (F5)

2200uf 25v will be fine, and what I've used in similar setups.. A 16v will be too close to the line but would be OK for a test. They will be polarised so + to + power.

forgive me for being stupid but is that 1 capicitor leg soldered on the reg/reg end and the other on the high beam of the bulb its self?

tell you what tommorow ill add some pictures so you or anyone else can see the setup, ive used bullet connectors
crimped and soldered them all.

on a side note i got the rear led brake to work off a 9v battery to test, but it only worked when the - was on the - part of the battery l, i assumed that it would just need grounding as is? but maybe it needs to be grounded to the input/output of the reg rec?

muck fe this electrical gubbins is harder than then carb adjusting or rebuilding a top end

[pscook]

Originally Posted by savage sausage

muck fe this electrical gubbins is harder than then carb adjusting or rebuilding a top end

I have nothing to add except that a good friend always told me "just remember it's electrical theory."

I agree that sorting out the electrons is MUCH more difficult than anything mechanical. Good luck!

[Neil E.]

Originally Posted by savage sausage

forgive me for being stupid but is that 1 capicitor leg soldered on the reg/reg end and the other on the high beam of the bulb its self?

Best to connect the capacitor across the rectifier output the same way a battery would be connected. Observe the correct polarity as F5 has mentioned.

[Neil E.]

Originally Posted by savage sausage

on a side note i got the rear led brake to work off a 9v battery to test, but it only worked when the - was on the - part of the battery, i assumed that it would just need grounding as is? but maybe it needs to be grounded to the input/output of the reg rec?

Depends on how you wired the system. Assuming the output of the rectifier is ungrounded, plus goes to your brake switch and then to the plus of the light. Minus goes to the minus of the light.