Relays SPDT to SPST
Posted: Mon Mar 10, 2014 3:13 am
I am having real issues sourcing Single Pole Single Throw relays with diodes in the UK. I can easily get SP Double throws with diodes (e.g. headlight relay) but not singles. I can use the SPDT for the fan relay as there is no wire running to the #87a pin so it would act like a SPST.
BUT, my Starter relay (07 SB) is a Single Throw with 2 x #87 pins and 5 wires.
My question is: on an SPDT can I run the wire that goes to the #87a middle pin to the #87 pin - then firing both on relay energising?
The wire I'm thinking of moving is the #58 "Fuel shut-off - Starter" currently sitting on the middle #87. I believe both 87's sit in open circuit at rest until the relay is energised when they both close.
My idea is that with the #58 and #87 wire (co-incidentally wired to a #87 relay pin) both wired into the #87 on the Double Throw relay that would do the trick. But, "Sometimes a little knowledge is a dangerous thing"
BUT, my Starter relay (07 SB) is a Single Throw with 2 x #87 pins and 5 wires.
My question is: on an SPDT can I run the wire that goes to the #87a middle pin to the #87 pin - then firing both on relay energising?
The wire I'm thinking of moving is the #58 "Fuel shut-off - Starter" currently sitting on the middle #87. I believe both 87's sit in open circuit at rest until the relay is energised when they both close.
My idea is that with the #58 and #87 wire (co-incidentally wired to a #87 relay pin) both wired into the #87 on the Double Throw relay that would do the trick. But, "Sometimes a little knowledge is a dangerous thing"