by spencerforhire » Tue Apr 23, 2013 6:18 am
Although black wires are usually reserved for grounds, in this case it is not. Things would sure get exciting if you did wire it that way; do you own a fire extinguisher? All the power for the whole electrical system(except the starter) flows through the ammeter in the early GT dash on the black and black white pair that originate under the hood. if you're not changing that harness as well, one or both will be dead anyway.
If you're adding any amount of extra load to you electrical system(fan, pump, lights, stereo), and/or upgrading the alternator, I strongly suggest you leave the ammeter disconnected; honestly it's a fire hazard. By the mid 70's, ammeters were replaced by voltmeters in the Vega GT dash and most every other vehicle.
There is still a "charge" or "battery" light in the GT dash; it needs to be hooked up to the existing wire so the alternator will charge.
On one of the first Vegas I converted to a GT dash I removed the ammeter and replaced it with an aftermarket volt gauge; much safer.
The "fleet"-
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
76 Vega GT- 400/4spd/9" retired from active duty(rusty)
06 Silverado 2WD ex.cab daily
03 Silverado 2WD ex.cab (retired)
06 Haulin' 20ft enclosed car transporter
06 GMC Canyon Shop truck
07 Colorado project( 5.3 4L60e swap)
99 Saturn SL1- wife's car
01 Saturn SC2- son's project
07 Saturn Ion Redline project
and 4 more Saturn "parts cars"
Note- the very act of listing all of these has made me realize I have some kind of problem.....
Visit http://www.spencerforhire.ca