All,
This entire analysis began because the headlight wiring diagram in the midyear Service Manuals, and LL's nice, laminated wiring schematic for midyear Corvettes is incorrect. I am trying to do a NONDESTRUCTIVE test, to determine what would happen to a Corvette's electrical system if the headlight bucket pigtail connectors were actually fabricated per the incorrect diagram. Thankfully, most of them are not. I did, however, recieve a set from Zip products a few years ago that was. I corrected it after examination, and BEFORE I turned on the "juice" to my headlights for the first time. The mucked-up pigtails were NOT fabbed by LL........to this day, I dunno who made them.
Attached, see photo of T3 no. 4002 sealed beam. With voltmeter, using my Corvette, I see that for lo beams, upper lug is energized, right hand lug is not; for hi beams, right hand lug is energized-upper lug is not. This effectively provides 1 filament for illumination; either the hi or lo filament. Is this right, or are the hi and lo filaments internally connected so that both are energized when 12 v is connected to the hi lug? I'm trying to determine whether or not BOTH lugs should be energized with hi beams on (effectively providing 2+1+2+1=6 filaments for illumination). It is very difficult to tell by looking inside the sealed beam and toggling between hi and lo beams.
If you look at the schematic, the dimmer switch appears to be a SPST switch, which diverts batt voltage between hi beam conductor, and lo beam conductor. IF, all 6 filaments were to be energized with hi beams, then the lo beam wire would have bypassed the dimmer switch, and the SPST switch would have merely energized/de-energized the hi-beam conductor.
I would like to have an old, burned out 4002 to disassemble and figure the internal wiring, but I do not.
Thanks in advance.
Joe
This entire analysis began because the headlight wiring diagram in the midyear Service Manuals, and LL's nice, laminated wiring schematic for midyear Corvettes is incorrect. I am trying to do a NONDESTRUCTIVE test, to determine what would happen to a Corvette's electrical system if the headlight bucket pigtail connectors were actually fabricated per the incorrect diagram. Thankfully, most of them are not. I did, however, recieve a set from Zip products a few years ago that was. I corrected it after examination, and BEFORE I turned on the "juice" to my headlights for the first time. The mucked-up pigtails were NOT fabbed by LL........to this day, I dunno who made them.
Attached, see photo of T3 no. 4002 sealed beam. With voltmeter, using my Corvette, I see that for lo beams, upper lug is energized, right hand lug is not; for hi beams, right hand lug is energized-upper lug is not. This effectively provides 1 filament for illumination; either the hi or lo filament. Is this right, or are the hi and lo filaments internally connected so that both are energized when 12 v is connected to the hi lug? I'm trying to determine whether or not BOTH lugs should be energized with hi beams on (effectively providing 2+1+2+1=6 filaments for illumination). It is very difficult to tell by looking inside the sealed beam and toggling between hi and lo beams.
If you look at the schematic, the dimmer switch appears to be a SPST switch, which diverts batt voltage between hi beam conductor, and lo beam conductor. IF, all 6 filaments were to be energized with hi beams, then the lo beam wire would have bypassed the dimmer switch, and the SPST switch would have merely energized/de-energized the hi-beam conductor.
I would like to have an old, burned out 4002 to disassemble and figure the internal wiring, but I do not.
Thanks in advance.
Joe
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