View Single Post
Old 08-10-2022, 11:01 AM   #6
fdryer
Super Member
fdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond repute
 
fdryer's Avatar
 
Join Date: Jan 2006
Location: NYC
Posts: 45,846
 

2003 L-Series 3.0L Sedan
Default Re: 4-Pin Relay Orientation?

Quote:
Originally Posted by billr View Post
...The 4-pin relays have the coil and contact pins on a "diagonal pattern", so will operate in either position. I am assuming there is no diode across the coil, which I think is standard for these type auto relays.

PS: never a ground on either 30 or 87...
You are correct about no ground on 30 or 87. My bad as I meant the ground connection is thru a resistance; horn, fuel pump, cooling fan, ac clutch, evap solenoid, fuel vent valve, etc. My apology as 12v going to ground thru contacts 30 and 87 would be dead short. 12v sent to a fuel pump on one connection and pump connected to ground powers the pump.

The only relay using a diode in parallel (to the coil) is the ac clutch relay.
fdryer is offline   Reply With Quote