Lighting dims question

[Penthode]

Originally Posted by Patrick L.

Yep, agreed. Others think the same. I'm wondering if we will ever know.

I strongly disagree. Without touching the brakes and switching on the headlamps only, the horn diminishes.

It is the wiring. Think about Ohm's Law. It is the DC resistance from the battery to the junction at the head lamp switch. Did you read my detailed post?

As was pointed out by Badpuppy, it could simply be a high resistance between the positive battery post and ground.

If it was a brake switch short, the ammeter would peg and you would get a bad smell...