electrical question

[lee]

I'm not sure this is the right part of the forum, but it is a tech question, and it's on an SVX, so...

Can somebody tell me what some causes for relay chatter/bounce are?

I have placed one in my SVX to bypass the Climate Control signal to the ECU because that part of the ECU is dead (everything else seems to function proper). I'm using the signal from the climate system that would go to the ECU to trigger a relay that provides ground to the relay under the hood for the A/C clutch - just what the ECU would do - except I lose the WOT cut-out by my method - I never drive that way anyway.

So, back to my question, when the system first kicks on the A/C there is a sequence of chatter, or bounce in the relay that damps out in short order. Don't know if it will help, but I'll include a circuit diagram I made of what I've done. FYI, this is a voltage follower circuit as I wanted to protect the climate system and wasn't sure it could trigger a relay anyway.

So, could I put in some capacitor and eliminate, or at least dampen, this bounce? On which side, i.e., low current trigger side, or high current clutch ground side?

edit: and I did this for like $5 vice the hundreds for a new ECU in case somebody is wondering