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
After fully recharging battery truck (2000 Nissan) still will not start,
Signed up for just answer. Been stalled since
I have exact same problem. Changed alternator, did load test. All fine. I've narrowed it down to lights relays or possible pnp switch since it only does it when it's in gear
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