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July 10th, 2005, 01:33 AM   #1
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AC Relay

Can you get a regulator that switches on when a AC voltage is detected but passes through DC. Why I ask is I want to be able to have my headlight run on DC from the battery but I don't want them to be able to run without motor running to avoid flattening battery.

I hate the lights running of the AC as the output varies so much and dims whenever any other device draws power, ie heated grips or brake lights. I have already wire brakes onto DC to avoid having lights dim when braking down hills etc.

Cheers Horto
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July 10th, 2005, 07:55 AM   #2
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I attempted something similar for my hot grips, i.e. I wanted to try them on DC rather than AC and have them shut off automatically when the engine was stopped. I tried several switches, none of which would respond to the AC signal therefore they didn't work.
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July 10th, 2005, 06:58 PM   #3
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Horto
1. Connect power from the battery, through the fuse (you can use the one connected to the battery as it is in the bike), through the contacts of a standard 12V DC power relay (eg driving light relay) to the positive of any electrics that you want to run only when the engine is running.

2. Connect the coil of the relay directly across the AC from the stator. The relay coil will be rated for DC, but it should work OK on AC (if it doesn't, post me, you may have to add an extra diode).

When the engine is running the AC from the stator will pull in the power relay & allow the electrix to run from the battery. The AC also goes into the rectifier in the usual way to charge the battery & power the electrix.

When the engine stops so does the AC. The diodes in the rectifier prevent power coming back from the battery to continue to power the relay coil. No power on the coil opens the relay & turns off the electrix.

Post if you have any problems.
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July 11th, 2005, 02:01 AM   #4
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Thanks Brad

Its ussing the AC to turn relay on that I'm not sure about. Will give it a go and report back.

Cheers Horto
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July 11th, 2005, 11:07 PM   #5
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Lots of relays use AC through their coils without a problem (eg mains powered relays). Putting AC through a DC rated coil will tend to reduce the current that flows through it due to the inductance of the coil. This inductance should be quite low in a Bosch 12V type relay. If the relay tends to buzz on AC, just connect a diode (eg 1N4001 or better) is series with the coil. This will block half of the AC so that the coil runs on a pulsating DC.

I was thinking - my bike had a relay already fitted to control the 12V electrix off the ignition switch. I found it to be a problem because, if you left the key on, the battery would get drained flat by power going through the relay coil even when all the lights were turned off. If your bike has this relay you could simply change the wiring so the relay coil does not get powered thru the ignition switch but instead gets run off the AC.
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July 12th, 2005, 06:26 PM   #6
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Hi Bundybear I have question would this work on a floating stator connecting terminal 85 and 86 to each wire comming out of stator?

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July 12th, 2005, 06:57 PM   #7
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Originally Posted by VIKING
... would this work on a floating stator connecting terminal 85 and 86 to each wire comming out of stator?
Should do. Relays that have two seperate coil connections such as the 85/86 terminal ones do not care what voltage either terminal is at with respect to ground - they just don't like having too high a voltage applied between the terminals for long as it smokes the coil. I assume there is also a regulator conneted across the floating stator in your bike to stop the voltage getting too high. If there isn't then the system would blow up other bits anyway.
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August 8th, 2005, 08:25 PM   #8
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Hi BundyBear I wired relay term 86 and 85 to each wire coming out of
floating stator did not work added a diode same result next I wired stator
lead to 86 and 85 to ground with diode it worked as long battery was charging but when batt. was charged up voltage became to low to close relayit cycle on and off as batt. was charging each cycle would last about a minute well I am out of ideas
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August 8th, 2005, 11:52 PM   #9
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What kind of stator - SEM or Kokusan? I'm assuming the SEM.

If it was SEM, did you connect between the big blue wire & one (or both connected together) of the yellows? This is correct.

If you connected across the two yellow wires you don't get any voltage as the output of the two windings cancel each other out.

If you did try the first way & it did not work, you will have to connect a diode better than 50V @ 1A in series with the relay coil, and a capacitor, probably better than 1000uF, 35V across the coil. Be careful to get the polarity the right way around on the capacitor or it will rupture & send bits of paper eveywhere. It should work as you require, don't give up.
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August 9th, 2005, 12:07 PM   #10
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Hi BundyBear its a Trail tech rewound kokousan stator with floating ground SEM and OE kokousan has fixed ground in stator chassi sorry I
was not clear on what stator i had
thanks VIKING
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