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Old 03-21-2023, 07:32 PM   #1
Quiche2192
 
Join Date: Oct 2018
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SR20DET voltage dropping when under electrical load

I have an S13 SR20DET in an S14 chassis.

Electrical power has been pretty bad around idle. My idle is around 850RPM. With the car at idle, lights on, high beams, interior lights on, radio on, my battery voltage slowly just keeps going down and down at idle.

The issue does not show up when the car is not under electrical load. With lights off etc. voltage holds up just fine at around 13.8 V at idle.

I have replaced the alternator, didn't help. I have checked wiring, all good connections and good condition. Replaced the battery, didn't help.

I tested something. I had the car on, no electrical loads. Disconnected battery. The alternator can run the car just fine at idle. But when I turn on the headlights, car just dies.

I have tested for ground faults by checking current draw with the car off. 0.01 A draw.

Tested grounds, all good.

I have found sliiiiightly higher than ideal voltage drops when measuring positive alternator to positive battery and negative battery to grounds.

Would appreciate any help.
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