Truck Shuts off when headlights turned on.
When i turn my headlights on the truck shuts off. All electrical systems shut off. i have three volts at the battery main relay. If i wait 10-20 mins it comes back on. Already tested battery, looked at fuses, and replaced alt.
Have your alternator checked. In the old days you'd check the alternator by removing the positive (+) battery cable with the engine running and switch on the headlights. If it stalled your alternator was bad. Kinda sounds like what's going on here. Note: do NOT attempt to test the alternator like that with today's computer controlled vehicles!! You WILL cause serious, possible irreparable, damage to your vehicle's electrical systems!! HTH. -Jim
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