viker123

Hey There, All brake light bulbs operative. CC still inop. Blinks a couple times after engagement, then nothing. Electrics still good. Thanks Vic

Thanks, I'll chk it out tomorrow. V

Well people, all I did was take the cables off and take a look. They looked clean and zero corosion. Been a few days now and have driven both with and w/o lights and so far full out put back to battery from new alternator.. Have no idea what caused the prior readings. Speedo and tach seem a bit off and the cruise stopped working so I'll have to look see what that's all about ! Always something with older cars I guess !!

Thanks guys, Battery is less then 1 year old and fully charged. I did same test today and got full output with load as no load !! Go figure. Drove it 40 miles and retested and got 14.2 with load and same w/o load.. I did wiggle positive cables as there seems to be two attached to that terminal. I will remove toomorrow and check for corrosion and clean. I'll let you know what I find and thanks for the responses. Vic

Thanks. I will chk tomorrow but my recollection when I replaced the alt. was the lead was clean w/ no corrsion. I am measuring at battery terminals so that I can see if input to battery is a plus or a minus. Thx I will also chk ground from bat to chassis

Hello Again, This is giving me fits. 14.2 output from new alternator. As soon as I turn on lights, .46 output ! It is clear that when a load is placed on the system, it stops working. Any ideas would be most helpful. This is a brand new alternator so don't think it is an issue with the unit itself. Is there a relay or something in the system I should be checking? Thanks Vic milage is only 112000

Hello Again, This is giving me fits. 14.2 output from new alternator. As soon as I turn on lights, .46 output ! It is clear that when a load is placed on the system, it stops working. Any ideas would be most helpful. This is a brand new alternator so don't think it is an issue with the unit itself. Is there a relay or something in the system I should be checking? Thanks Vic

Hello again all you experts, I did all the tests recommended and rechecked the trunk wires. No breakes found in trunk, but zero output from alternator. Bit the bullet and purchased a new alternator and installed this date. Initial test showed max output when I started the car. I let it warm up as I cleaned my hands and then I turned on the lights and the heater and fan. Output dropped to almost nothing. I turned everything off and rechecked (engine still running) and it showed a better output then when loaded, but nothing like when I first tested it. The alternator has a built in regulator I believe so that should not be the issue. It was mentioned a possible dirty contact somewhere? Terminal;s are spotless so tell me where I should be looking next. Can't drive the car as have no trust ion electric. Thank you Vic

Hi Landar, The lights dimmed as the battery had finally run out of juice. As I stated, the engine picked up as soon as I turned off the lights and I made it the final 1/4 mile to my home. Where are these mysterious 120 amp fuses located? Does the owners manual show a schematic? thanks for the response. What I really don't understand is how it now shows a full output from the alternator although the bad connection may be the source. Terminals are clean and tight on battery. Thanks again

Hi, New to Forum but it seems you have the answers ! I have a 1990 LS400, one of first delivered from Longo Lexus in El Monte, CA. Absolutely zero problems until recently. I was driving on a somewhat long trip( 6 hours) and about 1/2 way, all the dash lights came on. The engine seemed OK, but I stopped and called my son. He arrived and the car started right up, no dash lights other then normal at start up then go out. Now getting dark so had to turn lights on. I was almost to my destination, when headlights got very dim and engine started to sputter. Turned off lights, engine caught and I made it into my driveway and it quit completely. Next AM, it started and I checked and ZERO output from alternator. Charged battery, ordered new alternator and when it arrived, I went to install, but gave alternator a check again and guess what? IT WAS PERFECT ! Drove 70 miles with lights on and all electrical and rechecked and zero problems. Over 14 amp output ! No PS oil on old alternator. Any ideas? Is there a relay of some sort? Kinda nervous about going on road again. Thanksfor your help