Burning coils

[dhutton]

When I measure the resistance from the block to the frame, it is about 0. Is that not good enough?

Dhutton, are you saying to put my voltmeter leads on the block and the frame and then turn on the lights? I would be very surprised to see a reading.

Thanks, guys.

Yep, that is what I am saying. The high resistance of this connection will cause a voltage drop when the headlight current flows through it. At least that is my suspicion. I think this voltage drop is what is frying your HEI.

Similarly measure the voltage drop from the negative of the battery to the block and also from the battery to the frame.

Edit: I just noticed this is a Corvette, I assumed it was a Cuda based on your username. I think everything still applies except the grounding of the body.

[cudaman]

So you can read no resistance, but still have a bad ground, right?

[dhutton]

So you can read no resistance, but still have a bad ground, right?

I think it depends on the scale of your ohmeter. Say you only had .1 ohm resistance but your headlights draw 10 amps (numbers are for an example only), that would give you a 1 volt drop which is not good.

Some meters may not read resistance this low.