Author Topic: Installed headlight modulator, worked great, then blew fuse  (Read 799 times)

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Offline flivver

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Installed headlight modulator, worked great, then blew fuse
« on: November 09, 2013, 10:30:41 pm »
Worked great for about 30 miles of riding, from daylight into nighttime. All of a sudden -- thankfully while stopped -- the headlight fuse blew.

Do I need a 15A fuse with a modulator, or is this a symptom of something perhaps amiss with the modulator?
AMA #2994244 / 2002 ZG1000 / 2000 Honda Shadow VT750C (sold)
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Offline Cap'n Bob

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Re: Installed headlight modulator, worked great, then blew fuse
« Reply #1 on: November 09, 2013, 11:42:01 pm »
 It shouldn't need anything different fuse wise. The modulator actually should extend the bulbs life. I seriously doubt there is a problem with the modulator itself. If there was a problem with the modulator, I would expect it to blow the fuse right  away, not 30 miles or so later. I would first look for simple things. Maybe check and make sure that you didn't rub a wire on the frame or something.

Offline Cap'n Bob

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Re: Installed headlight modulator, worked great, then blew fuse
« Reply #2 on: November 09, 2013, 11:53:28 pm »
 Maybe a fluke and a new fuse might be fine. I've had this happen with the radiator fuse before. I just chalked it up to a weak fuse since it never happened again. Another thought, if you're still blowing fuses. You could try unplugging the modulator and plugging the bulb back in without it, then see if it holds.

Offline Cap'n Bob

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Re: Installed headlight modulator, worked great, then blew fuse
« Reply #3 on: November 10, 2013, 08:44:23 am »
   Another thought, make sure you have decent connections on your plugs (or anything else involved in the circuit). High resistance caused by dirty electrical connections could also pop the fuse. When resistance to electron flow goes up, your current draw will go up. Thus possibly blowing the circuit fuse. Although more than likely, unless your plug is visibly dirty or corroded, this is probably not the cause. Just another idea on things you can check for. Although cleaning and lubing (with electrical grease) is never a bad idea. And the OEM headlight plugs can and do get dirty. And nothing is saying the modulators plugs couldn't be dirty either. Again, just another idea of things you can check to rectify the situation.

Offline flivver

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Re: Installed headlight modulator, worked great, then blew fuse
« Reply #4 on: November 10, 2013, 07:53:17 pm »
I unplugged everything and hit all the contacts (except the ones on the bulb, because I couldn't reach them) with Deoxit.  Did the same with the fuses, and reinstalled everything.  So far, so good.  We'll see what happens...
AMA #2994244 / 2002 ZG1000 / 2000 Honda Shadow VT750C (sold)
Lowered Pegs, Handlebar Risers, Madstad 16" Windscreen, Grip Heaters, Murph's Side Cover Knobs, Bergmen Quick Release
I love this place!