Buell 2003XB9S Service Manual page 534

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Diodes
See Figure 7-18. The diodes are located in the fuse block
under the seat.
1. See Figure 7-19. Locate diodes within fuse block.
2. Test diodes using Starter Test flow charts under
NOSTICS.
3. Identify the diode which must be replaced. Replace both
diodes if necessary.
4. Replace the diodes by pulling them straight out. The
spare diode may be used in either circuit as long as it is
installed in the correct direction.
8892
DIAG-
Figure 7-18. Fuse Block (contains diodes)
b1003a4x
Diode 1
Diode 2
30
Battery
7.5
ECM
15
Lights
15
Key Switch
Figure 7-19. Fuses and Diodes
15
Ignition
7.5
Accessory
15
Brake/Horn
7.5
Cooling Fan
15
Spare
7.5
Spare
2003 Buell XB9S: Electrical 7-19