2000 charging issues

[ginericLC]

I’m having a charging issue in my 2000 LC. It has a rebuilt Denso alternator (which i pulled out and had tested). I tested all the plug connections to the left fender triangle plug for continuity and they were good. I took apart the fusible link and cleaned and tested all of the fuses. I tested the charge wire to the fusible link. I checked all the fuses in the fuse boxes related to gauges, battery, charging etc…. I’ve swapped batteries 3 times. I polished the battery connections. I believe the problem is that the alternator is not getting excited so it is not charging. I’ve stared at wiring diagrams. I have one thought about the daytime running light circuit causing issues as I disabled it. But that was a couple of months ago. Any thoughts?

 

[TahoeZ]

What is the:
-Voltage at alternator while running?
-Voltage at battery?
-Voltage in TechStream?

 

[ginericLC]

What is the:
-Voltage at alternator while running?
-Voltage at battery?
-Voltage in TechStream?

I don't have techstream. Voltage at the battery is about 11.8 volts while charging. At the alternator post 17.4. In and out of the 100A fuse 17.4. So it is overcharging I think. But the charge isn't reaching the battery. That 100A fuse feeds the inside fuse box. What else does it feed?

 

[hoser]

I think you have corrosion or a broken connection at your fusible link junction. Try running a cable from the alternator charge post directly to the positive terminal on your battery and retest.

 

[ginericLC]

I think you have corrosion or a broken connection at your fusible link junction. Try running a cable from the alternator charge post directly to the positive terminal on your battery and retest.

I don't because I have power on both sides of the link. Same voltages on both sides.

 

[hoser]

The battery is directly connected to one side of the fusible link. And the battery is getting 11.8 volts. Explain that. Bad battery ground?

 

[ginericLC]

 

[ginericLC]

View attachment 4142135View attachment 4142135View attachment 4142135

Here are the voltages on both side of the fusible links.

 

[ginericLC]

Battery now reads 11.8 across the terminals. It also reads 11.8 at the input wire to the interior fuse box. I think my issue is in my fuse box. If I do a continuity check between the interior input to the fuse box with the 17.4 side of the fusible link it shows continuity. But that input to the interior fuse box never goes over 11.8 volts. So somehow through that wire it loses voltage.

 

[Dirt J]

Looks like you have some terminals mislabeled on your diagram.

As suggested, probe the lead from your alternator and see what the voltage is.

 

[ginericLC]

2000 I figured it out. It wasn't the initial problem. But it was the last problem There is a bus bar on the back side of the fusible link. It fell out when I took it off to clean all the contacts and didn't get put back on. It is all working now. Really Toyota over complicated the fusible link. This one is better than the later models for corrosion But they could have done a more simple design with fewer parts.

 

[BnvS]

2000 I figured it out. It wasn't the initial problem. But it was the last problem There is a bus bar on the back side of the fusible link. It fell out when I took it off to clean all the contacts and didn't get put back on. It is all working now. Really Toyota over complicated the fusible link. This one is better than the later models for corrosion But they could have done a more simple design with fewer parts.

Aah did you take any pictures of the fix?