Help me identify this part. Picture included

duanelr · December 02, 2019, 06:02:52 PM

Under the seat, behind the battery, and zip-tied to the frame. I have my finger on the part in question.
What does it do?

FJ_Hooligan · December 02, 2019, 09:59:16 PM

Looks like an aftermarket light modulator.

Does your headlight or taillight flash?

CutterBill · December 02, 2019, 11:29:47 PM

That's the diode block.

And what year is your bike?
Bill

Pat Conlon · December 03, 2019, 12:15:27 AM

Bill...it's in his sig line...'87

duanelr · December 03, 2019, 11:12:15 AM

Quote from: CutterBill on December 02, 2019, 11:29:47 PM
That's the diode block.

And what year is your bike?
Bill

Thank you. As Pat wrote, I have an '87.
Ahhh, there are diodes in there. It's such an unusual looking part and seemingly just squeezed under the frame.
Do you know what aspect of the bike they are used for? (I ask only out of curiosity).

Pat Conlon · December 03, 2019, 12:30:22 PM

Duane, FYI Bill Cutter created a bitchen current flow diagram to help us understand the logic of the FJ's wiring harness. If I understand the nomenclature correctly, I see some diodes on the clutch safety switch circuit. Diodes keeping the current flowing one way, preventing backfeed.

Even though this diagram is for the Gen 4 FJ's ('91-93) I would expect to see the same diodes on your '87.
Bill is working on current flow diagrams for the earlier 3 generations of FJ's.

http://www.fjowners.com/index.php?topic=18991.msg192459#msg192459

CutterBill · December 03, 2019, 06:20:17 PM

Quote from: Pat Conlon on December 03, 2019, 12:30:22 PM...If I understand the nomenclature correctly, I see some diodes on the clutch safety switch circuit. Diodes keeping the current flowing one way, preventing backfeed.

True. There is also one diode for testing the oil pressure warning light when the starter button is pushed.

Quote from: Pat Conlon on December 03, 2019, 12:30:22 PMEven though this diagram is for the Gen 4 FJ's ('91-93) I would expect to see the same diodes on your '87.

Also true.

Quote from: Pat Conlon on December 03, 2019, 12:30:22 PM...Bill is working on current flow diagrams for the earlier 3 generations of FJ's.

Yep. The 84-85 diagram will be easy. The others will be horrible. I'll need to copy and print those crappy Yamaha drawings as large as possible just so I can highlight the wires as I go. Give me time...
Bill

Pat Conlon · December 03, 2019, 06:42:50 PM

Thank you for doing this Bill. Breakfast is on me at the next FJ Rally.

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Help me identify this part. Picture included