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Welcome, usss7 try this, for some answers on using the site. http://www.steelsoldiers.com/faq.php , also in the top menu bar) And yes, that sounds normal.

You need to see the same voltage on the top as the bottom, after a couple seconds. They will both drop from 24(or whatever you have) down to 12.5 ish,. while the relay is activated. If they dont match, then the relay is bad. If they do match, but are not in the 12.5v area, you have glow plug...

I would suggest you either have a bad relay or a dead short on the glow plug wiring(relay to glow plugs) or your battery cables are shot. It also sounds like your controller card may not functioning correctly.(not sure yet) One more test you could do easily is, measure the input voltage on...

hmm, You should have seen about 12.5 volts on the bottom, instead of 4-6. Glow plugs sound ok(0-3 ohms is good). If you use a jumper wire and ground the light blue wire on the relay, to ground, does your relay hold on, or still chatter?

There is no need to unplug the card. You can safely jumper the blue wire on the relay terminal, to a good ground, while it is all assembled.

I don't think it matters what position it's mounted for proper relay function. Since it's mounted "sideways" to begin with. Chattering relays are usually an indication of a bad connection or low voltage.

Was the junk truck an M1008 or M1009? The relay has to have a coil that is NOT grounded by the mounting bolts.