Electrical Problem
Thread Starter
Driver School Candidate
Joined: Aug 2009
Posts: 4
Likes: 0
From: California
Electrical Problem
Recently, my 1990 Lexus LS400 ran into an electrical problem. I can start the car and drive. However, the dashboard light, radio, and seat adjustment do not work at all. Only the headlight and interior lights work. After a day of driving, the battery becomes drained so I assumed the battery was not getting charged by the alternator. But when I took both the battery and the alternator to my local auto store to be tested, they both tested good.
So my question is what components to check for next? I am guessing the wiring and relays? If so, how to check to see if a relay is in working order or not?
So my question is what components to check for next? I am guessing the wiring and relays? If so, how to check to see if a relay is in working order or not?
Lexus Test Driver
Joined: Apr 2004
Posts: 1,265
Likes: 9
From: MA
Thread Starter
Driver School Candidate
Joined: Aug 2009
Posts: 4
Likes: 0
From: California
Thx for the info on the trunk wires. I checked and did indeed found two broken wires (One white and one green). However, even after I reconnect the two wires, the problems remain the same. Besides headlight and interior light, all other electrical system do not work. No suspension, no dashboard light, no power window/door lock/moon roof, and no battery recharging. Car still remain startable and drivable.
What other wiring/relay should I be looking into?
What other wiring/relay should I be looking into?
Lead Lap
Joined: Mar 2009
Posts: 423
Likes: 1
From: Hawaii
man i got almost the same problem as you but the things that aint working on my car is
my cluster/dash, radio, ac, turn signals, and hazards dont work....
my fuses are still good also
but i think it maybe wiring
my cluster/dash, radio, ac, turn signals, and hazards dont work....
my fuses are still good also
but i think it maybe wiring
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Driver School Candidate
Joined: Jul 2009
Posts: 3
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From: tx
I just fixed my 98' LS400. It was a cartridge fuse. look real careful because the top of fuse (where you can the copper) was not burned/broken. When I attemped to pull the fuse only the case came up. I could see where the fuse had melted at the bottom. It will be a fuse under the hood and if it was not burned where you can see at the top thru the clear plastic, it should at least be a little cloudy from the smoke generated from when the fuse burned at the bottom. Just fixed mines and have not test drove or anything but I had the EXACT same problem.
Thread Starter
Driver School Candidate
Joined: Aug 2009
Posts: 4
Likes: 0
From: California
Thanks very much. It was indeed the 120A Alternator Fusible Link that caused the problem. The top of the fuse was not burned or broken. But the fuse was melted at bottom.
I replaced the fusible link and clean/scrub the connectors. Car now runs great!!! Thank again for the help!!!
I replaced the fusible link and clean/scrub the connectors. Car now runs great!!! Thank again for the help!!!
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kwikrnu
LS - 1st and 2nd Gen (1990-2000)
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Dec 19, 2007 10:57 PM
