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turbo74pinto

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  • Lexus Model
    1992 LS400

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  1. the alt has been in now for a hand full of days and roughly 150 miles put on it with no lights!! looks like that was the problem. also, i think the car is sold, lol. i let someone use it while i fixed their car. i called them yesterday to tell them their car was ready and they asked how much for the lexus. so, i think its going to another owner from here. fine by me, more hot rod money!! thanks again for the help! bob
  2. i think the problem is solved. i put an alt in today and it ran for 2 hours. no lights. all light flickering is gone also. ill let you know after a few days how it acts. bob
  3. fiveofakind, check my thread, i did find a little bit more with my car. ill keep you posted. bob
  4. a little more info. i had about 30 min to look at it a little today before i went out and bought yet annother car. my house and shop are looking like a used car lot. anyhow, when i got back to the shop from work i started it up and let it run. as ive said before, i have no problems with it when its cold. so as the cars idling i opened the trunk and looked at that harness. its all original and no cracks or broken wires that i could see. i waited for the light to turn on. it flickered a couple times then stayed off again. i opened the hood and got my dvom out to test batt voltage. reved it a few times and they came on. i wiggled and moved the wires around on that trunk harness...no change. i went back to the batter to test voltage. it was a little higher, around 14.9ish. i goosed the gas to roughly 4500 and the headlights got brighter and never dimmed. the idiot lights on the dash were flickering bright to dim erraticly. checked the battery voltage, 15.6ish. goosed the engine about the same a few more times, lights dimmed and back to 13.8ish volts. goosed again and had spikes up to 17.6ish volts. all these spikes and readings is what i was getting at an idle, not during the revs. i did not check the connections at the back of the alt. i wanted to but there was something about my hand being next to that hot header. needless to say, i didnt "f" with it. im pretty confident that this is an alternator/regulator issue with mine. while the idiot lights were on i would rev it quick to 4500-5000 (tach doesnt work so i dont know exactly) and they would go off. rev it again after a few seconds they would go on. priced the alt at my parts distributor and its only 107 before tax. ill have it monday although i dont know when ill put it in. sometime next week. in the mean time, ill check those connections on the back of the alt and let you know what i see. bob
  5. battery is new. ive been reading a little on this trunk harness issue. i may try to look at that harness tomorrow also. thanks bob
  6. the batt tester does do a ripple test which it passed. keep in mind, thats with the tester hooked to the battery. i have no clue whats going on b y the alternator. you know, i should have checked codes. i dont think there are or were. when i got back to the shop, i disconnected the battery for a few and hooked it back up to see if the lights would turn back on or not when restarted. they came back on. if i get a few min tomorrow, ill see if there are any codes. thanks bob
  7. hi. it seems as though my car thinks its christmas. just so you know, i did do some searching and infact fiveofakind also posted a simalar problem. the car is a 92 ls400. ive been driving the car for about 2-3 months now. about 3 weeks ago, i had a few dash lights flicker then go off. a day or so later, they flickered and stayed on for about 5-10 min then went off again. the lights illuminating are red brake, battery, low coolant and low oil. now, after the car is warm they come on and stay on. cold starts when i leave the house, there are no lights on. after i drive roughly 5 minutes, they all come on. when they first come on, they do flicker a little. they also seem to turn off with acceleration and braking for a minute or so. then they just stay on. when the dash light rheostat is not turned all the way clockwise, the lights flicker. but once its switched to full bright there are no problems. i suspected an alternator or battery problem. battery is new as of feb. terminals tight and clean. passes a battery load test. alternator puts out a rough average of 14.1 volts at idle. passes under load and no load. load tests are done with my battery/starter/charging tester from caltron. volt tests just with a plain old dvom. the ps pump was leaking and is replaced. this started about a week before i replaced the pump. today, i drove for a little more time then normal and the yellow trac light came on in the middle of the speedo. it was raining so i punched the gas from a stop. trac was dissabled. shut the car off and restarted, light went off and trac worked fine. i pulled the wiring diagram from all data and it seems the only wire those 4 original lights have in common is the yellow alternator wire. i havent gotten any farther that that as of now. no time for my own junk it seems. i did not test how many amps this alt is putting out either. i figured id post this and see if anyone else has run into this and what they have done. thanks bob
  8. hey everyone. ive aquired a 92 ls400 with 165 k on it for cheap. this is the first lexus ive owned. it had been sitting for about a year and a half due to a relative loosing his license. ive replaced quite a bit on it and its still not quite up to snuff yet. although, the car is good looking and nice to drive. bob
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