No Charge '04 LX 470

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Dysfunctional Vet

Dysfunctional Vet

Joined
Sep 17, 2023
Threads
1
Messages
8
Location
Texas
Already checked stickies.

Have an '04 LX 470, can't get the battery to charge. Appreciate any help.

Battery-checked out will take/hold charge.

Fuses- checked s fuses and both fuses in engine compartment (attached photo with yellow marks at sides of fuses) all good.

Alternator- passed charge check at O'Reilly, even bought a Denso replacement, same thing alternator(s) checks out fine, battery will not charge.

I've checked power at the alternator, its fine. Meaning I have 12v at the black cable/terminal with the 10 mm nut. I can't check for power at the 4 prong cannon plug at the alternator while its running, but I have unplugged the cannon plug and checked continuity front the plug to the connector up by the battery, continuity is good.

I have power at two wires from the fuse box to the alternator at the connector near the battery in the photo I'll attach.
Pretty much run out of ideas why this won't charge.
Again, would appreciate any help on this one.
Dysfunctional Vet

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Maybe try checking the fusible link block, I have seen some of those heavily corroded
 
X

Thread 'LX470 Fusible Link Box and Wiring'

Hi everyone. Long talk lurker, first time poster. I searched the forums but couldn't find an answer to my current challenges.

I have a 2003 LX470 and the battery died out of the blue yesterday. The truck wouldn't start and took two jump packs connected to crank. I had the battery checked and it was good. So I followed the wiring, and saw the fusible link box off the positive terminal was heavily corroded.

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I took it apart, and the whole part basically disintegrated.

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I found the fusible link box part (82620-60030) and have that ordered. My...
  • Wow
 
Looks like an entirely different design from the fusible link setup on my '01, and aside from brittle plastic that crumbled when I tried disassembling, everything internal looked ok on visual inspection, but changing it out corrected my charging issue. If everything seems ok visually, I'd still see if you could clean any connection points well.
 
Does anyone have a source for a schematic/troubleshooting guide for an '04 batt/alt circuit? Still can't figure out why the LX will not charge.
 
Last edited:
Are you getting 13V+ at the alternator charging stud when running?
 
Dirt J said:
Are you getting 13V+ at the alternator charging stud when running?
Click to expand...
I'm not getting 13v at the wire that comes from the stud to the positive batterypost, only getting battery voltage. I'm checking it near battery +. Hard to get meter lead to stud down on alternator while its running.
But when I had the alternator out I ran a continuity check on that wire, continuity was good.
 
I don't think the alternator is charging.
 
Some other things you can check are to make simple checks from the center of a battery post to different points on the primary battery cables. For example center of positive post to the connector that goes around the positive post. Looking to see if you're getting voltage drops/high resistance between those two points. If you get yourself some T Pins and alligator clips, or just get a back probe kit(I believe Harbor Freight sells them) you can back probe your connectors and have it set up so then you can actively see what's going on at those connectors while the engine is running.
 
duowing said:
Some other things you can check are to make simple checks from the center of a battery post to different points on the primary battery cables. For example center of positive post to the connector that goes around the positive post. Looking to see if you're getting voltage drops/high resistance between those two points. If you get yourself some T Pins and alligator clips, or just get a back probe kit(I believe Harbor Freight sells them) you can back probe your connectors and have it set up so then you can actively see what's going on at those connectors while the engine is running.
Click to expand...
Checked everything you mentioned above. Plus wiring, grounds, fuses, even the back pins to fuses just in case the connection was intermittent...nothing.
I'm starting to think its the ECU. I've run out of ideas.
- Not the battery
- Not the alternator
- Not the wiring or fuses

If you have any thoughts, I'm open to ideas or comments. Can't think of anything else to check. I'm not even sure how to check if the ECU is the culprit. I've had two other (non-pro, non-Toyota) mechanic friends look at it. They can't figure it out either.
 
If you aren't getting 13+ volts from the alternator, it's the alternator.
 
Stupid question, but is the charging gauge on the dash working/registering anything? Also are you getting the battery light on the dash when it's running?

Was the vehicle originally charging properly then it stopped? It sounds like you've pretty much checked everything. Where did you get the Denso alternator? Also you could try taking the alternators to another store to get them tested. Finally I know Eric O from South Main Auto mentioned in a video that a lot of the newer battery testers that parts stores and mechanics use will flag a battery as good where an old school tester that puts a real load on a battery will show it's bad. He even demonstrated it in his video.
 
duowing said:
Stupid question, but is the charging gauge on the dash working/registering anything? Also are you getting the battery light on the dash when it's running?

Was the vehicle originally charging properly then it stopped? It sounds like you've pretty much checked everything. Where did you get the Denso alternator? Also you could try taking the alternators to another store to get them tested. Finally I know Eric O from South Main Auto mentioned in a video that a lot of the newer battery testers that parts stores and mechanics use will flag a battery as good where an old school tester that puts a real load on a battery will show it's bad. He even demonstrated it in his video.
Click to expand...
Alt is from Toyota.
I've double checked both alternator (new and old) they're running just fine at the parts stores (o reillysand advance). I thought I had it figured out, charging worked for a short while. Even got 59 miles away one day. Parked at a Walmart. When I took off I soon noticed the battery guage showed low. Checked under the hood and sure enough, it wasn't charging again.
I even replaced the wire from the alternator to the battery just in case it was an intermittent crease malfunction. Worked fine, then for no reason the alternator stops charging.
I really think its the ECM. At this point I've triple checked everything else.
Now I have to check the stickies for properly ordering an ECM. Will take any suggestions, I am all out.
 
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