Mazda Bongo Wiring Manual
This flash drive contains scans of the various Mazda wiring diagrams for vehicles up to September 2002.
Although it does not cover the later edition Bongos we understand that the electrical changes were not significant.
Circuit diagrams are in Japanese but contents pages are in English.
A competent DIY auto-electrician should be able to interpret it.
Not for the faint hearted!
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