[Diy_efi] Bosch fuel injector plug wiring.

[Torbjörn Forsman]

Older Bosch injectors are not polarity sensitive, there may both 
polarities exist. Newer ones have the positive terminal to the left, 
when the injector is oriented as you describe. On those injectors, a + 
sign is molded into the plastic on the left side of the connector. Older 
injectors may have either a plain round recession in the plastic, or a 
Bosch logo at that position. There may also be a logo in the same place 
on the right side.
It seems like the polarity sensitive injectors may have been introduced 
around 1990, although older types have still been in production far into 
the nineties.

A method for determining the correct polarity for a injector is to 
supply it from a lab power supply with adjustable current limiter. 
Increase the current slowly until the injector opens and record the 
value. Then reverse the polarity and repeat the test.
The injector will have lower opening current at correct polarity than 
with reverse polarity.

Best regards

Torbjörn Forsman

Joe Boucher wrote:
> If I look straight into the electrical plug, with the exit orifice pointing
> down, which wire is positive?
> 
> Anyone know off the top of their head without a big research project?
> 
> Thanks,
> 
> Joe Boucher
> 
> 
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