flyeyes
Well Known Member
Hi all.
I feel I'm generally pretty good with electrical stuff, but there's always the problem that I "don't know what I don't know."
Standard practice is to wire the B lead of the alternator to the switched side of the battery contactor.
Why?
It seems to me that if the contactor is opened while the alternator is running, the alternator will become unstable without the battery until (hopefully) the overvoltage protection shuts it down.
Is there a failure mode that I'm not seeing that would be better wired this way? Why not wire the b-lead to the battery, or the battery side of the contactor?
I'm assuming there is a reason, I just am not seeing it.
Thanks in advance for what is likely a stupid question.
I feel I'm generally pretty good with electrical stuff, but there's always the problem that I "don't know what I don't know."
Standard practice is to wire the B lead of the alternator to the switched side of the battery contactor.
Why?
It seems to me that if the contactor is opened while the alternator is running, the alternator will become unstable without the battery until (hopefully) the overvoltage protection shuts it down.
Is there a failure mode that I'm not seeing that would be better wired this way? Why not wire the b-lead to the battery, or the battery side of the contactor?
I'm assuming there is a reason, I just am not seeing it.
Thanks in advance for what is likely a stupid question.