Too much voltage to headlights?
Here's an example of how resistance in the output circuit can impact voltage.
The battery state of charge is low. That's why its drawing 20 amps at 13.9 V.
If/when the battery is fully charged, the alternator only has to power the ignition. That's only a few amps even with electronic igntion.
Lets say its 5 amps.
So that's 5 amps through the resistance in the output line.
V=I x R
V = 5 amps x .06 ohms
V = .3 Volts
Everything works like normal until the lights and other stuff is turned on...
A somewhat similar situations would be if there is resistance after the main splice, either on the battery feed or the feed to the key switch and ignition.
Bottom line is to check the voltage and the ammeter under the conditions suggested in my previous post. That will show if its an overvoltage problem.
Here's an example of how resistance in the output circuit can impact voltage.
The battery state of charge is low. That's why its drawing 20 amps at 13.9 V.
If/when the battery is fully charged, the alternator only has to power the ignition. That's only a few amps even with electronic igntion.
Lets say its 5 amps.
So that's 5 amps through the resistance in the output line.
V=I x R
V = 5 amps x .06 ohms
V = .3 Volts
Everything works like normal until the lights and other stuff is turned on...
A somewhat similar situations would be if there is resistance after the main splice, either on the battery feed or the feed to the key switch and ignition.
Bottom line is to check the voltage and the ammeter under the conditions suggested in my previous post. That will show if its an overvoltage problem.
