Why does my glow-plug relay go nuts after a warm engine restart?

[sparkoid]

I replaced the glow plugs and relay awhile back on my 1.6na.  Ever since, when I drive to the store, pick up my cold beverages and then re-start the truck for the ride home, my glow plug relay clicks like a banshee for the ride home.  The ride to the store was long enough for the temp gauge to find it's mid-point sweet spot, and on re-start, the glow-plug "wait" light on the dash does not come on, all of which I presume means the engine is sufficiently "warmed up".

This originally on my 1.6na which is now a door-stop; the 1Y I just replaced it with does the same damn thing...

Any ideas out there?

[ORCoaster]

Ground Wire, it is loose, broken, frayed or otherwise intermittently going out on you. 

[fatmobile]

Or the seperate wire on the battery post might be loose.
What kind of car?

[sparkoid]

It's an '81 diesel pickup.  The windshield leaks of course, so the fuse / relay panel has been drenched more than once.  Anyone have any ideas / tricks on how to recondition these things?  And the terminal lugs on the harness that hooks up to them?

[fatmobile]

Then the ground connection is behind the fuse box. Screwed to the firewall.

[air-cooled or diesel]

perhaps you can try to use a silicone trim/gasket sealant to seal the windshield for a while, you got to stop your electronics from getting wet; your floor too; rust, you may need to junglegym under there and get a good look at all contacts; you dont want to end up having to replace the relay box, or fuse box either, relays are expensive enough.