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  1. #1
    The Nitrous Outlet Junkie


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    Troy
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    Default Alternator functionality

    I converted my car to carb and got rid of the PCM and wiring harness I'm now running into problems getting the alternator to charge the battery ... I took it off and had it tested three different places alternator is fine how do I get it to charge the battery though. I think it has something to do with the Exciter wire.
    A few places people told me to use a 470 Ohm resistor but I'm not sure what to do with that.
    94 Formula "budget build" #thebeaterbird
    10.177 @128.31 on a lil 250 shot
    350, LT1, carb, LE grind cam, th400, 4k stall, ford 8.8 w/ 4.10s

  2. #2
    Xtreme Member


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    Default

    Quote Originally Posted by zooguy View Post
    I converted my car to carb and got rid of the PCM and wiring harness I'm now running into problems getting the alternator to charge the battery ... I took it off and had it tested three different places alternator is fine how do I get it to charge the battery though. I think it has something to do with the Exciter wire.
    A few places people told me to use a 470 Ohm resistor but I'm not sure what to do with that.
    you made another thread, for us to tell you the same thing again. 12v positive to switch to resistor to exciter wire.

    Sent from my SAMSUNG-SM-G935A using Tapatalk
    2021 Charger Scat 392
    1994 Firebird Formula 381 stroker - Carrying the torch! - 9.90 @ 134.3mph on a 200 shot

    The wrench/driver for LTConvert's 94 Z28- Ellwein 383/LE Trickflows/ D1SC / CPT Ultra Pro Race 4L60E
    10.78 @ 125mph. Shooting for 9.99 for Frank Cahall!

  3. #3
    The Nitrous Outlet Junkie


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    Default

    The other thread was for me to figure out how to get my voltmeter to function I've got that working now. thanks for your help.

    However I now know my problem is not with the voltmeter but the alternator and I know very little about how Electronics work so please forgive me for reaching out for help

    Sent from my SM-N910T using Tapatalk
    94 Formula "budget build" #thebeaterbird
    10.177 @128.31 on a lil 250 shot
    350, LT1, carb, LE grind cam, th400, 4k stall, ford 8.8 w/ 4.10s

  4. #4
    Xtreme Member


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    Default

    Quote Originally Posted by zooguy View Post
    The other thread was for me to figure out how to get my voltmeter to function I've got that working now. thanks for your help.

    However I now know my problem is not with the voltmeter but the alternator and I know very little about how Electronics work so please forgive me for reaching out for help

    Sent from my SM-N910T using Tapatalk
    12v positive to switch, out of switch to resistor, then crimp connector to exciter wire/plug

    voltage gauge wired thru a switch, then to the charging wire that runs from battery positive to alternator

    that's how both need to be wired.

    Sent from my SAMSUNG-SM-G935A using Tapatalk
    2021 Charger Scat 392
    1994 Firebird Formula 381 stroker - Carrying the torch! - 9.90 @ 134.3mph on a 200 shot

    The wrench/driver for LTConvert's 94 Z28- Ellwein 383/LE Trickflows/ D1SC / CPT Ultra Pro Race 4L60E
    10.78 @ 125mph. Shooting for 9.99 for Frank Cahall!

  5. #5
    LTX Regular


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    Default

    He did tell you how to use it. Connect one end of the resistor to the exciter wire and the other end of the resistor to a switched ignition point.

    1998 Trans Am - LS1/A4 - all stock and almost all original - one owner - driven daily.
    Author of Scan9495, free pc apps 93-95 LT1,94/95 L32: http://ltxtech.com/forums/showthread...light=scan9495

  6. #6
    LTx Guru


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    Default

    I posted the factory wiring diagram in the other thread, showing the location of the resistor, and how to incorporate it into the voltage gauge and exciter circuit, but that didn't seem to help.
    SOLD - GONE TO A (VERY) GOOD HOME ! - 94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / CC solid roller / TH400+GearVendors OD / 4.11 Strange 12-bolt / 300-shot N2O / Spohn Suspension / roll bar / MoTeC M48 Pro engine management system /a few other odds 'n ends.

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  8. #7
    The Nitrous Outlet Junkie


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    Sorry for wasting your times

    Sent from my SM-N910T using Tapatalk
    94 Formula "budget build" #thebeaterbird
    10.177 @128.31 on a lil 250 shot
    350, LT1, carb, LE grind cam, th400, 4k stall, ford 8.8 w/ 4.10s

  9. #8
    The Nitrous Outlet Junkie


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    Default

    Fingers crossed

    Sent from my SM-N910T using Tapatalk
    94 Formula "budget build" #thebeaterbird
    10.177 @128.31 on a lil 250 shot
    350, LT1, carb, LE grind cam, th400, 4k stall, ford 8.8 w/ 4.10s

  10. #9
    The Nitrous Outlet Junkie


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    Default

    Well that didn't work ..... I connected it to the switch for my ignition and ran it straight to the alternator single wire connected to the plug any ideas why it won't work?

    Sent from my SM-N910T using Tapatalk
    94 Formula "budget build" #thebeaterbird
    10.177 @128.31 on a lil 250 shot
    350, LT1, carb, LE grind cam, th400, 4k stall, ford 8.8 w/ 4.10s

  11. #10
    LTX Regular


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    Default

    Try measuring the voltage at the resistor end connected to the alternator. It should have about 12v when the ignition switch is on.

    How are you determining that the alternator is not working?

    By the way, that looks like good work on the resistor insulation.

    1998 Trans Am - LS1/A4 - all stock and almost all original - one owner - driven daily.
    Author of Scan9495, free pc apps 93-95 LT1,94/95 L32: http://ltxtech.com/forums/showthread...light=scan9495

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