Headlights & Dash run at 1/2 power - Any Ideas
06-16-2012, 07:50 AM
#1
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Squid
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Join Date: May 2009
Location: Belmont, New Hampshire
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Headlights & Dash run at 1/2 power - Any Ideas
Hey all, on my 98 Hawk I have found since I bought it three years ago that the headlights and dash lights run at like half the brightness that they should. I only know this because on a handful of times it has snapped up to full brightness at night for a few miles then back off. And that is super rare that that happens. I have checked connections and all seem ok. Battery seems to charge fine, bike runs decent (although I wonder if I am also getting less spark because of this) and I just can't really ride at night because the lights are too dim. I also had the bike die on me yesterday, completely dead. The fuse in the starter motor blew while I was riding and I lost all electrical until I got towed home, tore the bike down a bit and found the bugger. To me this is an indication that there is an issue with the regulation of the electricity. I am leaning towards it being the regulator/rectifier but wanted to get some other input. Thank you so much all for your help!
06-16-2012, 01:30 PM
#3
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Superstock
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Join Date: Jun 2005
Location: San Antonio, TX
Posts: 489
The starter motor does not have a fuse, but the starter RELAY does contain the main fuse for all the smaller gauge wiring. It will usually blow when the regulator is bad. This is quite common on our machines. See the thread in the Knowledge Base about Mosfet Regulators before looking for a replacement unit, and be sure to examine the wiring for heat damage. You may need a new battery as well since a bad regulator can cook a good battery.
The intermittent brightness of the headlight is from the regulator overpowering the system. Many here find the headlight to be somewhat weak. Fix the charging problem first and then evaluate headlight options.
The intermittent brightness of the headlight is from the regulator overpowering the system. Many here find the headlight to be somewhat weak. Fix the charging problem first and then evaluate headlight options.
06-25-2012, 07:39 AM
#4
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Squid
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Join Date: May 2009
Location: Belmont, New Hampshire
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Thank you so much guys. I didn't have time to track down a MOSFET unit this time, picked up an aftermarket, over sized SH model with a large heatsink. Part came in, tore the rear end apart at my office in the parking lot, swapped it out and we are good to go! Headlight actually works, can see the dials clearly and it is actually charging the battery. So nice to be able to fix things on my own without paying a shop to troubleshoot and change out a part. Thank you, thank you, thank you.
06-25-2012, 09:33 PM
#5
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Join Date: Jun 2005
Location: San Antonio, TX
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Since you are using a stock type replacement unit, I suggest coating the connector and terminals with dielectric grease. It will keep moisture from corroding things, and also makes unplugging easier. You could also grease up the 3 wire stator plug. The end result would be longer lasting components and a healthier battery.
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