Alt not charging - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

ka-t · 02-23-2012, 08:44 PM

i have a s13 redtop sr20det in a 1995 240sx , engine was pulled from my other s14 that had no charging issues . lower harness came out with the engine.

How i have the wiring setup
battery in trunk. power wire run to front of engine
using a large fuse block i have the battery wire and both white/red wires that go to the fuse box on one end and the large black/red wire out the other side.

I get 12v to the large black/red wire,so i know i have a good connection to there. Car starts fine but the alternator wont charge.

I have 1ohm through the black ground wire on the back of the alternator from post to chassi

Battery light is on and the brake light is on

I do get 12v to the wire on the connector to the alternator(yellow wire)

When vehicle is off and i check for voltage on alternator output post i have 9.09 volts and battery is at 12v. i know i have some kind or resistance in the wiring somewhere but when the car is running i have the same voltage at the post meaning that alternator is not putting anything out. so i pulled the alternator and put a ka alternator in there and tested again - still not charging

Any clues?

02-23-2012, 08:44 PM	#1
ka-t Leaky Injector Join Date: Aug 2005 Location: Arizona Posts: 128 Trader Rating: (0) Feedback Score: 0 reviews	Alt not charging i have a s13 redtop sr20det in a 1995 240sx , engine was pulled from my other s14 that had no charging issues . lower harness came out with the engine. How i have the wiring setup battery in trunk. power wire run to front of engine using a large fuse block i have the battery wire and both white/red wires that go to the fuse box on one end and the large black/red wire out the other side. I get 12v to the large black/red wire,so i know i have a good connection to there. Car starts fine but the alternator wont charge. I have 1ohm through the black ground wire on the back of the alternator from post to chassi Battery light is on and the brake light is on I do get 12v to the wire on the connector to the alternator(yellow wire) When vehicle is off and i check for voltage on alternator output post i have 9.09 volts and battery is at 12v. i know i have some kind or resistance in the wiring somewhere but when the car is running i have the same voltage at the post meaning that alternator is not putting anything out. so i pulled the alternator and put a ka alternator in there and tested again - still not charging Any clues?