When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
there are three schematics around this time frame so it matters when the machine was built and the model
i based mine off the late 1985 to 1986 schematic.
the 1987 > 1988 have the power tapped off the solenoid.
in either case, the relay operates the same.
1. power from key sw to ign circuit
2. ign circuit sends power to stop/run bar sw
3. power jumps to starter bar sw
4. power goes to relay #86, #85 is terminated to ground and completes the coil circuit
5. solenoid contact power enters # 87
6. power to solenoid coil leaves on #30 and completes the circuit to ground via the solenoid case.
the later setup flips the relay terminals #30 & # 87 but it does not matter, just contacts and flow direction does not matter. there was some wiring changes on the orange and tan wires.
lights were still in full circuit, violets jumped to brown. the relay has NO contacts so they cannot be in common.
there are three schematics around this time frame so it matters when the machine was built and the model
i based mine off the late 1985 to 1986 schematic.
the 1987 > 1988 have the power tapped off the solenoid.
in either case, the relay operates the same.
1. power from key sw to ign circuit
2. ign circuit sends power to stop/run bar sw
3. power jumps to starter bar sw
4. power goes to relay #86, #85 is terminated to ground and completes the coil circuit
5. solenoid contact power enters # 87
6. power to solenoid coil leaves on #30 and completes the circuit to ground via the solenoid case.
the later setup flips the relay terminals #30 & # 87 but it does not matter, just contacts and flow direction does not matter. there was some wiring changes on the orange and tan wires.
lights were still in full circuit, violets jumped to brown. the relay has NO contacts so they cannot be in common.
Not disputing this, OP said he read somewhere that "some" bikes will interrupt the Accessory circuit when the starter is engaged. In the schematic I posted that happens, evidently his bike is wired as you say.
Sorry for the confusion.......
i cannot see how that is possible unless there is a circuit modification.
the relay power to the solenoid that passes through the relay comes from a switched supply. in the later case, it is direct to the battery and that terminal is hot all the time.
the lighting is controlled by the switch. if there is lighting on the acc side, it will function. this would include flashers, park/run and brake.
it is possible for the lights to dim out due to voltage drop caused by the starter but the circuit is still in tact.
he never got back on where he was taking his tests at and specifically what he wants to accomplish, as it is, points to a bad battery side power or ground points. it is possible to have the starter function well and yet the other systems suffer, a look at how they are tapped explains it. if the main power connection is shinola and cannot be backed up from the battery, the system will run off the regulator and the output is too little to source the loads and voltage will be all over the place.
Look at the picture of the Ignition switch, the wire coming from the ACC is O and goes to connector 9. Just to the left you see the ACC Circuit Breaker and it's power comes from the starter relay, (line with arrow). Now go to the schematic that shows the starter relay, on the left side of the drawing you find connector 9. O goes to starter relay at #30 on the relay. #30 is common between the Normally Closed contact, 87A and the Normally Open contact 87(see picture of 5 terminal relay). So when the relay is the "shelf" position 30 is common to 87A and current from ACC at the Ign SW will flow through that contact to the ACC circuit breaker, (horn, spot lights...ect). When the start button is pressed 85 is the coil and "pulls in the relay" so 30 to 87A is now open and 30 to 87 is closed and the starter solenoid is energized by the power coming from the ign sw ACC on the O via 87. Release the start button and the relay goes back to "shelf" state where 30 and 87A are common.
I believe my short problem is due to the hazard switch having four wires crossed. That would effect both directional and brake functions resulting in short circuit causing volt meter to fluctuate.
Concerning the head light when wired according to schematic it and all other lights do stay on. Don't like that, so a friend showed me a simple modification at the circuit breakers that make all lights stay off until switch turned to lights position. All turn signals and brake lights work fine in this configuration.
It simply defeats the original safety design of having headlights automatically come on when bike is started.
Thanks to all for your help.
ok, i see what you are saying. the two print outs i have do not show the NC contact, so i will look at the next set for the following years to see if it is there, that print if i remember runs up into the 2000's models.
there are many schematics for those years. the two i printed is for late 85 > 86 and 1987 > 1988 fxst/c and 1988 1/2 fxsts.
does that schematic show switch function, curious to see if the jumpers are gone at the switch side which supplies the lights also?
i have the fsm 84 > 99
it shows in 1996 the 5 pin relay and a diff ign sw and the only ref to the extra wire was for int'l model.
so it is a good ? another hd mystery. but printed material was sometimes wrong.
i have used the SIP and i have issue with print out and sizing. only a jpeg of the components will tell the whole story.
i have the fsm 84 > 99
it shows in 1996 the 5 pin relay and a diff ign sw and the only ref to the extra wire was for int'l model.
so it is a good ? another hd mystery. but printed material was sometimes wrong.
i have used the SIP and i have issue with print out and sizing. only a jpeg of the components will tell the whole story.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.
