Re: voltage across battery when charging ?
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Originally Posted by Mustang_289
Yes we did - put a brand new Powermaster 140a alt on, same readings. We haven't touched it since then.
Here's what we've done to date:
* Changed alts with same readings.
* Swapped out the battery
* Relocated the battery to the front, removing these things from the equation:
- 2G wiring to the back of the car
- Ground to the frame in the rear of the car
- Kill switch located in the back of the car
* Checked and cleaned all the grounds
* Reconnected the ground strap to FW
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Following your problem, looks like some checking of the alternator output on the car is recommended....not in terms of voltage but, in terms of amps. I know this is not classic but, a checking of the power output w/inductive clamp is suggested. This to verify that the alternator is indeed producing output and, if it is, then concentrate on whats causing the voltage draw in your car. A short, severe enough to cause the alternator to go full blast in amps, will cause the voltage drop and keep it below the 14.5vdc "all fine" goal. My other 2¢. LUK.......this one is really interesting.
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ACRONYMS:
LUK=Let Us Know, GL=Good Luck, LMK=Let Me Know, JIC=Just In Case, BTSTDTRT=Been There Seen That Done That Repaired That and the classic... DILLIGAS=Do I Look Like I Give A S***
1986 Mustang GT w/T-Tops 
NOW: 5.0L Stock SB, X303 Cam, 700 cfm DP Holley, 289 '66 Heads, 1.7 RR, Richmond Gear 4+1 Tranny, Centerforce DF, 2.73 Gears
WIP: 3.90 Gears, LS Overhaul, Adj. LCA's & UCA's (Granatelli), T-Top weather striping and rear braces bodywork 
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