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Older SPST To SPDT Relay

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Member - Posts: 1
Member spacespace
Joined: February†15, 2021
Location: Florida, United States
Posted: October†19, 2022 at 3:50 PM / IP Logged Link to Post Post Reply Quote steelrain13
Hi all,
Love the site have used it for years and always find an answer I donít know. This time Iím off to something new for me I canít find a good answer for. Working on a 1989 crx dx (standard/base is the other name and is a standard transmission) and found the wiring to be good after repairs but bad relays.
Sure I could order replacements at 40+ each, or, could swap to newer relays that are easier to source.
I have some water proof spdt with the more common 5 pin that I figure I could use in place.
For the ac compressor Iíve confirmed white is constant red is output blk/yellow is ignition. Yellow says it goes to ecu. I may be wrong but based on the diagram it looks like yellow goes to ecu. I recall that the radiator fan which also says it goes to ecu is grounded via the temp switch so I suspect this may actually be ground in terms of the relay being wired.
The two fans have similar issues with bad relays but good wiring. The condensor fan I can set white as constant blk/yellow as ignition with blue/black out and looks like blu/red is again connecting to ignition.
Radiator fan looks to be similar?
Any thoughts or am I way off base?
Older SPST To SPDT Relay - Last Post -- posted image.
Platinum - Posts: 3,668
Platinum spaceThis member consistently provides reliable informationspace
Joined: October†27, 2003
Posted: October†19, 2022 at 8:49 PM / IP Logged Link to Post Post Reply Quote geepherder
Looks like a good plan. Probably not an issue, but you might also verify DC resistance of the relay coils is similar to the originals. That way you don't place any additional strain on the ECU. You could install suppression diodes across the coils as well to prolong relay life (minimize arcing across the contacts)- striped sides towards the positive source.
You could always replace the compressor clutch relay, too.
My ex once told me I have a perfect face for radio.

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