Strange Electrical Starting Issue - VZ L98 6L - Performance Forums

• Login or Sign Up
  • Logging in... Remember me Log in Forgot password or user name? or Sign Up
  • Log in with

• If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

• Forum
• Technical
• General

Announcement Collapse No announcement yet. Strange electrical starting issue - VZ L98 6L Collapse X Collapse

• Posts
• Latest Posts
• Photos

• Search
• Page of 1
• Filter

• Time All Time Today Last Week Last Month
• Show All Discussions only Photos only Videos only Links only Polls only Events only

Filtered by: Clear All new posts Previous template Next

• F3ARED Nutcase
  • Join Date: Nov 2012
  • Posts: 2576
  • Location: VIC
  #1

  Strange electrical starting issue - VZ L98 6L

  06-03-18, 09:11 AM Morning kents. Have a slightly strange issue with my VZ thats slowly manifested itself and now is a pretty constant annoyance. Want to advertise the car to sell it and cant really do that with the way it is so need to sort it out, and given I have zero fucking clue when it comes to electricals its best I ask here. Basically it first begun to show itself as a weakening battery; crank would get slower to the put where on occasion, it will do the real slow wind over and then end up tripping out the start sequence so Id end up with the car going in to limp mode. Charging the battery would make the problem go away until the battery slowly died in the arse again. Fellas at work said dead cell in battery; replaced battery, 3 days later same issue. Alternator output was ok last time i checked via on board "mode" on dash display; cant remember exact figure but from memory it was over 13V at idle. Will need to check again. Its not a voltage drain as you can let the car sit for a few days and it doesnt get worse. The more you start it the worse it gets. What gives? Charge rate not high enough? Starter fucked and drawing too much load on start? Ive no fucking idea where to start. N- Sta si trazio, to si dobio. 1978 Gemini Sedan - Powered by i change my mind every week - R.I.P 1982 944 Porsche 2012 JK Jeep Wrangler He Bought a Jeep 1994 E36 3 Series - 18 Again Tags: None
• ITS60S Registered User
  • Join Date: Dec 2007
  • Posts: 1679
  • Location: Sydney, Australia
  #2 06-03-18, 10:11 AM What volts does the battery show when cranking? Check and clean earths, should see 13.5v charge at idle Originally posted by race6.3l Only gripes are the bluetooth and stereo are bread and butter spec, not one person has been able to hear me properly during a call, even with my head all contorted towards the roof mounted microphone like im trying to growl a chic sitting on a clothesline

  Comment

  Post Cancel
• Sprinkles Registered User
  • Join Date: Apr 2017
  • Posts: 1101
  • Location: Sydney
  #3 06-03-18, 10:12 AM Have another look at the alternator charging rate, use a multi meter on the battery terminals with the engine running, so you can see how much charge is getting to the battery. It should be >14 volts at idle.

  Comment

  Post Cancel
• THE CHIEF Registered User
  • Join Date: Nov 2016
  • Posts: 1785
  • Location: Melbourne
  #4 06-03-18, 01:21 PM I had a similar experience on a vt ls1, got to the point where it would hardly turn over at all. Was the starter motor drawing too much voltage. If alt and battery voltages check out fine, start looking and testing the starter.

  Comment

  Post Cancel
• F3ARED Nutcase
  • Join Date: Nov 2012
  • Posts: 2576
  • Location: VIC
  #5 13-03-18, 06:24 AM Finally got a chance to actually run a multimeter over it, probably should have done it ages ago. It appears my alternator is fucked, 12V @ idle and wont change with RPM, but strangely no charge light and no warnings on dash? Whats the go here - is it completely fucked/bin it, or am i looking at voltage reg or other shit? Sta si trazio, to si dobio. 1978 Gemini Sedan - Powered by i change my mind every week - R.I.P 1982 944 Porsche 2012 JK Jeep Wrangler He Bought a Jeep 1994 E36 3 Series - 18 Again

  Comment

  Post Cancel
• Sprinkles Registered User
  • Join Date: Apr 2017
  • Posts: 1101
  • Location: Sydney
  #6 13-03-18, 07:16 AM Originally posted by F3ARED View Post Finally got a chance to actually run a multimeter over it, probably should have done it ages ago. It appears my alternator is fucked, 12V @ idle and wont change with RPM, but strangely no charge light and no warnings on dash? Whats the go here - is it completely fucked/bin it, or am i looking at voltage reg or other shit? The one time I had a regulator fail the alternator ended up over charging as the engine revs increased.

  Comment

  Post Cancel
• Xnke Registered User
  • Join Date: May 2013
  • Posts: 1427
  • Location: Bowling Green KY
  #7 13-03-18, 10:13 AM Is it one of the computer controlled alternators? Could be a broken wire going to the control line. Pull the alternator and get it checked, let us know how it goes. Right now, sounds like your alt is fucked.

  Comment

  Post Cancel
• Bob Vegana. Democracy Manifest
  • Join Date: Apr 2002
  • Posts: 16910
  • Location: Sonova Beach
  #8 13-03-18, 10:17 AM Probably has a fried starter/alternator harness too. Originally posted by brewdles In short, some cunt at test and tune had a 250cc honda turning to 11ty and it sounded porn. Do that.

  Comment

  Post Cancel
• F3ARED Nutcase
  • Join Date: Nov 2012
  • Posts: 2576
  • Location: VIC
  #9 13-03-18, 11:03 AM Originally posted by Xnke View Post Is it one of the computer controlled alternators? Could be a broken wire going to the control line. Pull the alternator and get it checked, let us know how it goes. Right now, sounds like your alt is fucked. I have no idea if its computer controlled or not. As youve probably gathered electricals are not my strong point. Any obvious ways to check? Originally posted by Bob Vegana. View Post Probably has a fried starter/alternator harness too. Id bloody hope not. Is this common on Commos or something? Sta si trazio, to si dobio. 1978 Gemini Sedan - Powered by i change my mind every week - R.I.P 1982 944 Porsche 2012 JK Jeep Wrangler He Bought a Jeep 1994 E36 3 Series - 18 Again

  Comment

  Post Cancel
• Bob Vegana. Democracy Manifest
  • Join Date: Apr 2002
  • Posts: 16910
  • Location: Sonova Beach
  #10 13-03-18, 01:02 PM Yeah, pretty common. Luckily a new harness is failry cheap, and about 20mins to replace. You'll know it's fucked when you undo the main cable off the back of the alternator, and it's all stiff, or just breaks off in your hand. Originally posted by brewdles In short, some cunt at test and tune had a 250cc honda turning to 11ty and it sounded porn. Do that.

  Comment

  Post Cancel
• F3ARED Nutcase
  • Join Date: Nov 2012
  • Posts: 2576
  • Location: VIC
  #11 13-03-18, 02:03 PM Originally posted by Bob Vegana. View Post Yeah, pretty common. Luckily a new harness is failry cheap, and about 20mins to replace. You'll know it's fucked when you undo the main cable off the back of the alternator, and it's all stiff, or just breaks off in your hand. Will have a poke around tonight and see whats what. Whats the likely hood its just a failed harness and not both harness/alternator? Sta si trazio, to si dobio. 1978 Gemini Sedan - Powered by i change my mind every week - R.I.P 1982 944 Porsche 2012 JK Jeep Wrangler He Bought a Jeep 1994 E36 3 Series - 18 Again

  Comment

  Post Cancel
• Bob Vegana. Democracy Manifest
  • Join Date: Apr 2002
  • Posts: 16910
  • Location: Sonova Beach
  #12 13-03-18, 02:14 PM I sent my alternator off to the sparky anway, as the power steering pump pissed all over it. Was apparently fine, but they gave it a good clean out, and threw some new bearings in it. The harness, I found that problem out when I removed the alternator. Originally posted by brewdles In short, some cunt at test and tune had a 250cc honda turning to 11ty and it sounded porn. Do that.

  Comment

  Post Cancel
• Jim Resident Oaf
  • Join Date: Nov 2001
  • Posts: 43754
  • Location: ACT Now!
  #13 18-03-18, 07:33 PM Ps leak is notorious for killing ls1 alts. Turns out, far too much has been written about great men and not nearly enough about morons Originally posted by seedyrom my neighbours called the cops...... not because of the sound of me working in the garage was too loud, but because i taped a cardboard box to my back, covered my self in vaseline and pretended i was a snail on their lawn

  Comment

  Post Cancel
• Bob Vegana. Democracy Manifest
  • Join Date: Apr 2002
  • Posts: 16910
  • Location: Sonova Beach
  #14 18-03-18, 07:42 PM Yeah, that was the basis for pulling mine apart in the first place. I'd not considered the harness failure until I'd actually found it. Originally posted by brewdles In short, some cunt at test and tune had a 250cc honda turning to 11ty and it sounded porn. Do that.

  Comment

  Post Cancel
• F3ARED Nutcase
  • Join Date: Nov 2012
  • Posts: 2576
  • Location: VIC
  #15 20-07-18, 07:33 AM Should have bumped this a while ago. Mr B. Vegs on the money - alternator was fried as was partial section of alternator room. Which came first I dont know, but its fixed now. Sta si trazio, to si dobio. 1978 Gemini Sedan - Powered by i change my mind every week - R.I.P 1982 944 Porsche 2012 JK Jeep Wrangler He Bought a Jeep 1994 E36 3 Series - 18 Again

  Comment

  Post Cancel

Previous template Next property of swedish industrys, dikhed Powered by vBulletin® Version go.fuck.yourself Copyright © 2026 MH Sub I, LLC dba vBulletin. All rights reserved. All times are GMT+10. This page was generated at 09:50 PM. Working... Yes No OK OK Cancel X