Yes the diode allows electricity to flow in only one direction it is used so that two circuits can control a third circuit, in this case the neutral safety switch and the clutch switch controlling power to the starter relay. The front turn signals should act as running light though but that function uses the orange/white and blue/white wires. Sent via BlackBerry by AT&T
-----Original Message----- From: Mike <[email protected]> Sender: [email protected] Date: Mon, 7 Apr 2014 04:56:12 To: <[email protected]> Reply-To: [email protected] Subject: Re: [Nighthawk Lovers] Electrical Problems...brake lights and turn signals Thank you very much for your help, Allen! I have the 91-99 Nighthawk Service Manual, this diagram differs slightly in layout as to the diagram I have. But its been so long since I had the bike running, and you're saying that I should not have any turn signals illuminated unless they are on, and I get no change when I unplug the tach plug and turn signal relay...well, Im really thinking I have a bad wiring harness! It would make sense, a wire is maybe pinched somewhere. In all honesty, it would take me less time to swap the original harness back onto the bike then it would for me to start testing all the grounds and leads again. I KNOW the old harness and bike worked fine before the flood, I only changed them out because I thought they were the culprit of a no start issue...which later turned out to be the starter relay needing to be reversed (aftermarket part). So ill find the old harness and try that one again (after checking and cleaning all the connectors). If you have any other ideas let me know! Ill post back with my results. By the way, what is a 'diode'? Is that the small square box I see taped to the harness near the battery? A non serviceable part? I noticed it but it seemed pretty sealed up so I didnt want to mess with it. On Monday, April 7, 2014 12:02:37 AM UTC-4, Allen wrote: > > Brakes: > Black/Brown is +12v going into both brake switches check for voltage > Green/Yellow is +12v going from brake switches to bulbs. Check for voltage > at bulb with switch activated. And no voltage with switch not activated. > Black/Brown also powers dash lights, front running lights, and horn so > those can be indicators of power hitting the circuit. > Black brown comes straight from the fuse block. > the tail light grounds on the green wire so check that for continuity to > ground. > > Turn signals: > They are powered by the same Black/Brown from the fuseblock. > the Orange wire is the signal wire for Left Turn, and Light Blue is for > Right turn. > Power goes to the turn signal switch first through the Black/Brown, then > out the Grey wire to the turn signal pod. > At the pod the Grey power goes to the Orange or Light Blue depending on > switch position. > the Orange or Light Blue wires are jumpered to the turn signal dash light. > The turn signals are grounded to Green. > The Diode is related to the kill system to prevent the starter button from > working if the bike is not in Neutral. > > Testing: > check for +12v at the turn signal relay. > Check for continuity to ground on the Green wire at the turn signal relay. > check for power on the grey wire going into the turn signal pod. > check for power on the orange and Light blue with the switch activated in > both directions. > check all green wires for continuity to ground. > To find the +v on ground, remove fuses one at a time until it goes away, > then trace that circuit until you find where the short is. > > Attached is the wiring diagram. > > > On Sun, Apr 6, 2014 at 2:01 PM, Allen Thomas <[email protected]<javascript:> > > wrote: > >> If my understanding is correct the turn signals should get no power at >> all if the relay is unplugged. Certainly there is no connection between the >> turn signals and brake lights. It sounds like your new harness has a short >> in it (power on ground), or possibly a bad diode. Do you have a manual or >> wiring diagram? I'll look at one tonight and see if I can give you a hand >> with a testing methodology. >> Sent via BlackBerry by AT&T >> ------------------------------ >> *From: * Mike <[email protected] <javascript:>> >> *Sender: * [email protected] <javascript:> >> *Date: *Sun, 6 Apr 2014 08:20:08 -0700 (PDT) >> *To: *<[email protected] <javascript:>> >> *ReplyTo: * [email protected] <javascript:> >> *Subject: *[Nighthawk Lovers] Electrical Problems...brake lights and >> turn signals >> >> Hey everyone! I have a 1992 Nighthawk 750 that ive slowly been putting >> together after Sandy. Its been a long process, and Im so close to the end, >> but Im stumped. My brake lights do not work (however the tail lights do) >> and my turn signals are always on. When I try to use the turn signal >> switch, it brightens one side and part of the tail light. The turn signals >> and brake lights function the same with or without the turn signal relay >> plugged in. The brake lights will not come on at all. The bulbs are fine. >> I checked and adjusted the switches for the brake lights, both work >> properly when tested with an ohm meter. My headlight works properly. My >> horn, starter switch, and engine off/run switch all work fine. Ive replaced >> many things on the bike so far, including: the entire wiring harness, the >> turn signal switch assembly, the turn signal relay, starter relay, the >> regulator/rectifier, and all fuses. When I check the grounds on the brake >> light I get a very faint positive reading, maybe .2v or less. Im pretty >> stumped here. If anyone has any input Id appreciate it. Perhaps a ground >> somewhere? Does anyone know if there are any near the lights I could check? >> Could the ignition control module cause this? I didnt replace it but the >> bike runs fine after Ive rebuilt the carbs. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Nighthawk Motorcycle Lovers!" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To post to this group, send email to >> [email protected]<javascript:> >> . >> Visit this group at http://groups.google.com/group/nighthawk_lovers. >> For more options, visit https://groups.google.com/d/optout. >> > > -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/nighthawk_lovers. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/nighthawk_lovers. For more options, visit https://groups.google.com/d/optout.
