FJRF009.0: Ground Spider Research

Yamaha FJR Motorcycle Forum

Help Support Yamaha FJR Motorcycle Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Status
Not open for further replies.
In the world of aircraft wiring, system designers strive to make it so no one failed wire/connector takes out more than one system. This Arachnophobia flys in the face of that theory.

This was a dumb a$$ move on Yamaha's part.

Arachnophobia.jpg


 
Revision 03 of the table follows at the end. I made a few adjustments to cover things discussed, but this table still shows worst case condition. In this condition we get the following total amperage on the individual spiders:

S1 = 5.85

S3 = 8.30

S4= 47.25

S6= 23.95

S7= 14.60

S8= 7.75

The following could be considered a more “normal” riding condition. I turned off fans, horns, and turn signals:

S1 = 2.35

S3 = 4.80

S4= 19.25

S6= 14.45

S7= 11.10

S8= 6.00

Worst Case Scenario:

4320386403_c4181763c7.jpg


4321083468_7362d7f5f1.jpg


 
Looking at the FSM wiring diagram, and looking at the wiring on the bike. It looks to me like the black wires (in the diagram) that end with one line threw the end is a spider, and where 2 wires meet to look like a splice may also be a spider.
Also I only see 3 chassis grounds.

-neg battery cable

-starter

-ABS ECU

....So maybe if someone didn't want to mess with the spiders they could remove the original grnd wires from the fans, ground the fans to the chassis by making up 2 new wires, then hook the original 2 fan grnd wires (previously removed) to the chassis. This will take the fans out of the equation and add 2 chassis grnd wires to the S4 (BLACK WIDOW) spider without modifying it...
I was incomplete in the text that accompanied the schematic screen shots. I should have been clear that the ground buss/common grounds ARE indeed the spider wires.

It may be a bit before Dave gets back to me about perhaps making simple grounding blocks to replace the spiders. The blocks will be easier than running new wires (I think) and will solve the electrical and heat problems of the OEM Black Widows.

Edited to add:

Alan draws with a blunt crayon -- Brass hex rod stock, 6 wires per spider, six faces on the rod stock. See the link in the paragraph above where I describe the block in more detail.

GroundBlock.jpg
Alan that is a good idea for someone who doesn't want to solder, and it may be a little easier given the tight location of the BLACK WIDOW spider.

I personally prefer to solder and heat shrink, then tape it to the harness with yellow tape to mark location. I also add a wire to chassis.

I only offered the previous idea for someone who didn't want to mod the wiring harness. I think it will take care of the overload. With the right wire terminals it could be a plug & play deal, but it won't be as easy as your block.

The fans have push on quick disconnects inside a plastic plug,(easy to R&R the wire), and I think the Acc. jack does also. But they may be a little hard to get to with bike assembled, I don't know because mine is all apart now. With lower fairing off they would be accessible.

I think as a min. the S4 & S6 spiders need to be "fixed" so we will have to R&R the lower fairing anyway in order to get to the S6 .

 
Here's an idea. ;) Maybe good , maybe not so good. Check it out and let me know. So maybe if someone didn't want to mess with the spiders they could remove the original grnd wires from the fans, ground the fans to the chassis by making up 2 new wires, then hook the original 2 fan grnd wires (previously removed) to the chassis. This will take the fans out of the equation and add 2 chassis grnd wires to the S4 (BLACK WIDOW) spider without modifying it.

Then they could tap into the Acc. jack or the glove box grnd wire or both, then run them to chassis also. This will add 1or 2 grnd wires to the S6 spider, and should take care of the headlights and shield drive.

I think that would take care of the overload situation. Of coarse they would still have to clean, and grease all the spiders once a year.

I couldn't have come up with this idea if not for RZ350s excellent chart of what goes where. Thanks RZ

More food for thought; A.C.
This is interesting. Can you get to the radiator wires by pulling the tank? Or do you need to pull side panels?

You are welcome for the chart - just trying to figure this all out (like the rest of us).

 
Here's an idea. ;) Maybe good , maybe not so good. Check it out and let me know. So maybe if someone didn't want to mess with the spiders they could remove the original grnd wires from the fans, ground the fans to the chassis by making up 2 new wires, then hook the original 2 fan grnd wires (previously removed) to the chassis. This will take the fans out of the equation and add 2 chassis grnd wires to the S4 (BLACK WIDOW) spider without modifying it.

Then they could tap into the Acc. jack or the glove box grnd wire or both, then run them to chassis also. This will add 1or 2 grnd wires to the S6 spider, and should take care of the headlights and shield drive.

I think that would take care of the overload situation. Of coarse they would still have to clean, and grease all the spiders once a year.

I couldn't have come up with this idea if not for RZ350s excellent chart of what goes where. Thanks RZ

More food for thought; A.C.
This is interesting. Can you get to the radiator wires by pulling the tank? Or do you need to pull side panels?

You are welcome for the chart - just trying to figure this all out (like the rest of us).
See previous post.

 
Fan current SWAG (scientific wild ass guess), usually items are fused for twice their average running current. The radiator fans are fused @ 15 x 2 so a good guess is 7.5 amps each. On my one fan Gen I, when the radiator fan kicks on the Datel shows a major power hit.
If this is a close guess, it would be the highest power consumer and begs the question...

[SIZE=14pt]For the guys that have actually had spider failures, does your riding condition make the fans run a lot? (e.g. Do you sit in traffic often or for long periods of time?)[/SIZE]
Well, as a data point, my S4 (aka Black Widow) spider failed during the Jan 3 cold snap in Flori-duh, the temp was in the low 60s. I was running the heated jacket, but that's separately wired from the Batt. The failure happened during riding, so the fans were NOT on at the time.
I'm not necessarily asking about what the condition was at the time of the failure (although that is important too), but more curious about the normal conditions the bike sees. Anytime the spiders see excessive current, they could be degrading. The actual failure could occur sometime later at a random time if they were in a weakened state.

Even in FL, I don't see the fans come on much - mostly just at the long stop lights.

 
RZ, thanks for the updated chart, this is really handy.

From memory, the fan wiring is not accessible from under the tank. However, the lower fairings take only a few mins to pull off, and then you have full access to the fans and their wires.

 
I used your method, but put the wire through the side of the cap and ran the ground to the fuse block. The cap snaps back on securely and I zip tied it just to make sure.
Well, I guess this proves there is room for the solder inside there. Thanks for giving it a try and reporting to us.

 
RZ, thanks for the updated chart, this is really handy.From memory, the fan wiring is not accessible from under the tank. However, the lower fairings take only a few mins to pull off, and then you have full access to the fans and their wires.
Thanks - never had them off yet (knock on wood).

 
Just another thought...

The largest GROUP of items using the most power is the lighting (see note 9 in the table), with the headlights accounting for 10 amps by themselves. There's been many advances in lighting technology lately, so is there any chance of reducing the demands on the system by replacing the incandescent bulbs with higher efficiency versions (LED or similar)? You will need to replace them sooner or later anyway.

 
Last edited by a moderator:
[SIZE=12pt]Can someone measure the ACTUAL radiator fan amp draw?[/SIZE]

Since this component (well there is really two that come on together) potentially is the largest SINGLE power user, I would like to know this before I formulate a solution.

 
Just another thought...The largest GROUP of items using the most power is the lighting (see note 9 in the table), with the headlights accounting for 10 amps by themselves. There's been many advances in lighting technology lately, so is there any chance of reducing the demands on the system by replacing the incandescent bulbs with higher efficiency versions (LED or similar)? You will need to replace them sooner or later anyway.
Replacing your headlights with an HID upgrade kit removes the entire headlight load from the bike's harness as the upgrade kit wires power directly from the battery through it's own relay. This would remove all of their ground current from any spiders and also the current on the positive side that runs through the self-destructing ignition switches.

 
No electrical wizzard here, but IMHO the fix in post #255 might be better than the one in #258? Soldering a ground wire to the spider still allows all current to pass thru the spider itself,whereas grounding the fans seperatly removes some of the load. In the interest of not hacking up the harness,one could use a posilock line tap on each of the fan ground wires and run a wire to chassis ground for each, thereby providing additional paths for both the fans and the spider without cutting wires..What think?

 
No electrical wizzard here, but IMHO the fix in post #255 might be better than the one in #258? Soldering a ground wire to the spider still allows all current to pass thru the spider itself,whereas grounding the fans seperatly removes some of the load. In the interest of not hacking up the harness,one could use a posilock line tap on each of the fan ground wires and run a wire to chassis ground for each, thereby providing additional paths for both the fans and the spider without cutting wires..What think?
And maybe do the same to each existing headlight ground?

 
Last edited by a moderator:
Alan that is a good idea for someone who doesn't want to solder, and it may be a little easier given the tight location of the BLACK WIDOW spider.
I personally prefer to solder and heat shrink, then tape it to the harness with yellow tape to mark location. I also add a wire to chassis.

I only offered the previous idea for someone who didn't want to mod the wiring harness.
Soldering is good as long as someone has the equipment, the skill and the wires aren't damaged. I have ripped off dcarvers picture because it shows a good example where the copper wires are too burned to be solderable. When copper takes on a pinkish red color they are too heavily oxidized for solder to wet and flow even with electrical grade flux.

Too burned to solder without cutting the wires back to an undamaged area.

Burnt-1.jpg


 
Obviously that damage is too bad to repair in any way without cutting back to undamaged wire, so there is no question you are going to end up with a modified harness, unless you so desperately want to return to the original crappy design that you find a source for the connector pins, connector shell, and a new spider.

But why would you want to do that when just cutting back to undamaged wires and joining them together without a connector would be better than the original?

 
No electrical wizzard here, but IMHO the fix in post #255 might be better than the one in #258? Soldering a ground wire to the spider still allows all current to pass thru the spider itself,whereas grounding the fans seperatly removes some of the load. In the interest of not hacking up the harness,one could use a posilock line tap on each of the fan ground wires and run a wire to chassis ground for each, thereby providing additional paths for both the fans and the spider without cutting wires..What think?
And maybe do the same to each existing headlight ground?
The headlight grnd sounds better than the Acc plug or glove box grnd. The only reason I mentioned those earlier is because I thought it would be easy to get to. Either way it will help the S6 spider. But by taking the headlight out of the chain would be better I think.

 
Here are some numbers for you RZ. Hope this helps.

Fan Amperage Draw

10A in rush with 4.7A constant (1 fan measured, using DVM so inrush could be a little higher.)

Horn

2.2A constant

Headlight

5.1A constant for the Hi Beam

4.6A constant for the Low Beam

These numbers were obtained by running wires direct from the battery so they do not include relay and system loses.

 
Here are some numbers for you RZ. Hope this helps.
Fan Amperage Draw

10A in rush with 4.7A constant (1 fan measured, using DVM so inrush could be a little higher.)

Horn

2.2A constant

Headlight

5.1A constant for the Hi Beam

4.6A constant for the Low Beam

These numbers were obtained by running wires direct from the battery so they do not include relay and system loses.
Running off the alternator at 13.8V instead of the battery's @12.6V will result in slightly higher currents.

 
Status
Not open for further replies.
Top