Posted: Sat Jun 25, 2011 10:19 am
Congrats! And thanks for the update.
Like I said, the black relays are changeover, hence you had a direct short to ground and blew the relay.
The headlight relay (not the hi-lo relay, but the brown "power switching" relay) is a dual-pole on-off relay (DPST) - assuming that's the relay used.
But I'd have to look over your previous posts - I'm not sure now which relay is being bypassed etc.
The original grey "starter" relay CUTS power to the aircon during cranking. It's failure to supply aircon power (ie, when NOT cranking) means its NC (Normally Closed) contact had failed.
And NC contacts are more prone to failure because they only have spring force - not the more powerful coil supplied electro-mag force. So when springs get weak, and cars vibrate, contacts get dirty, hot, and fail.
FYI:-
- a GREY relay can be imitated with two normal change over relays (SPDT). (Or 1xSPDT and 1xSPST (plain on-off) since only one NC (SPDT) contact is used.)
- a BROWN relay is merely 2 ordinary SPST (on-off) relays.
Both solutions have their coils paralleled.
Like I said, the black relays are changeover, hence you had a direct short to ground and blew the relay.
The headlight relay (not the hi-lo relay, but the brown "power switching" relay) is a dual-pole on-off relay (DPST) - assuming that's the relay used.
But I'd have to look over your previous posts - I'm not sure now which relay is being bypassed etc.
The original grey "starter" relay CUTS power to the aircon during cranking. It's failure to supply aircon power (ie, when NOT cranking) means its NC (Normally Closed) contact had failed.
And NC contacts are more prone to failure because they only have spring force - not the more powerful coil supplied electro-mag force. So when springs get weak, and cars vibrate, contacts get dirty, hot, and fail.
FYI:-
- a GREY relay can be imitated with two normal change over relays (SPDT). (Or 1xSPDT and 1xSPST (plain on-off) since only one NC (SPDT) contact is used.)
- a BROWN relay is merely 2 ordinary SPST (on-off) relays.
Both solutions have their coils paralleled.