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My '73 left me beside the road yesterday. dead battery and (apparently) no alternator juice going into it. Just wondered what the voltage should be at the back of the alternator with the engine idling. I'll charge my battery back up, start it and measure the voltage. Also for all ya'll that have upgraded the alt to a higher amp version, what'd ya get and where for how much? Thanks
dr
dr
'73 coupe,ZZ4, S&P Tunnel Ram intake, Accel 6.0 DFI, 6-link rear susp, Stewart Stage III wtr pump ///
'96 LT4 CE...bone stock
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g
Free Member
Send PMDOWNINGTOWN, PA - USA
Joined: 11/24/2001
Posts: 962
Vette(s): 1969 Monza Red Black Conv / Black Vinal hardtop
454/480 Tremec 5 Speed 308 Posi.Black Leather Interior, PS, PW, Air cond., tilt/tele,AM/FM Cass.-5 Pack CD, Hurst Shifter, side pipes
2004 Yellow convertible with black top and black interior
I picked up a 135 amp chrome alternator from e-bay for $99.00. It is offered by a retailer every once and a while. I have seen it three times so far.
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If you up grade from a 63amp alternator to a 100amp do you need to change any wires ?
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j
Former Member
Send PMEastern part of, CT - USA
Joined: 1/29/2002
Posts: 319
Vette(s): White 73 convertible - 350/auto, A/C PS, PB, PW, leather, t/t, two tops
Also had a 69 t-top 20 years ago
You should get 14+ volts at the alternator. Your wiring should be OK. Joe
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Thanks Joe ..................... 
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The back of the alternator should be your supply,,, 12 volts (battery voltage)
EdelBrock Performer w/ 750 doub pumper,port/polished heads, triple cut valves w/4th cut down the throat of the exhaust valves, 286 Comp Magnum cam, 1.6 roller rockers, ball-peen pushrods w/guides, screw in rocker studs w/girdles, Comp double-roller chain, , hi-rise valves covers w/ spacer (needed for the girdles), Flowtech by Holley long-tube ceramic coated headers into Stage II pipes (no cats), chrome wire looms for the MSD 8.5 mm wires, MSD 50,000v coil kit w/advance springs, cap, rotor, module, steel-braided radiator,heater,vacuum hoses, Infinity Kappa 4x6 plates (dash), Sony Xplode 6 3/4" (rear), chrome T-stat housing, A-arm shields, B&M Hammerhead shifter
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in Forum: C3 Electrical, Body and Interior
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