Bosch relay question.

[Pete Masterson]

See
< http://www.classictruckshop.com/clubs/ea...cts/bosch/
relay.htm> for info about how a Bosch relay is put together.

85 and 86 control the magnet coil and, presumably, must have
continuity to operate.
30 and 87a have continuity when there is _no_ power to 85 and 86.
30 and 87 will only have continuity when there -is- power to 85 and 86.

Pete Masterson
aeonix1@...
'95 Blue Bird Wanderlodge WBDA 42'
El Sobrante, CA




On Dec 6, 2006, at 8:22 AM, toddad538 wrote:

> I have a question regarding a Bosch 5 terminal relay.
>
> I have continuity between terminals 30 and 87A.
> I don't have continuity between terminals 30 and 87.
> I understand that when the coil on terminals 85 and 86 is energized
> the continuity between 30 and 87a will go away and I will have
> continuity between 30 and 87.
>
> Just for fun I tried checking for continuity between terminals 85
> and 86 and there is none.
>
> Question:
> If I don't have continuity between 85 and 86 how does the coil
> become energized.
>
> I would think that there must be continuity between 85 and 86 to
> complete the circuit thus energizing the coil.



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