Measuring Continuity....??? Options

[FrankB2]

Okay.... I recently tested a relay for continuity, and two terminals caused my meter to beep, and the other two terminals caused my meter to read .064 without beeping. I came across a car forum question, in which the poster was using a 4 pin toyota relay on his hot rod, and was testing continuity. This was the same normally closed relay I was testing, and he got the same results. One person said the .064 was continuity for Toyota relays. I'm not an electronics wizard, so if anyone has any knowledge here, that'd be great. I broke a relay case yesterday tugging it out, and picked up a new relay this morning. It's supposed to have continuity across two pins and no continuity across the other two (fan relay no. 2) without power. Both the new and old relay read .061 ohms across the pins that are supposed to have continuity, so I'm guessing that's continuity without the beep.

[Special_Edy]

Okay so terminal 86 is the input, terminals 85 is ground and these are most likely a wound coil that act like a magnet to throw a small mechanical switch inside the relay. The mechanical switch bridges 30 (which is 12+ from the battery) and terminal 87(the output to the accessory) so power can flow to the component of the car being powered by the relay.

So 87 - 30 should have no continuity and 85 - 86 should have continuity. How much, I dont know. But there should be some resistance present.


I wonder, if the relay is stuck ON then wouldnt the fans run even with the ignition shut off? I think the relays are wired straight to the battery not through the ignition.

Try turning the car on so that the fans begin running, then pull the relay out and test for 12v across terminals 85 and 86 in the socket of the fuse/relay box. If 12v is present then the ECU is erroneously telling the fans to run, if 12v is not present then the relay is likely the culprit