Re: '69 Camaro Charging system questions
Voltage regulator is adjusted correctly after 15 minutes of run time at 1500 rpm, no accessories on and when ambient temperature at VR is 125°F, voltage should be within 13.5-14.3 volts, nominally 13.9 volts at battery.
If adjustment is needed, note voltage reading from 13.9 volts, pull VR cap straight off -don't touch anything - watch voltage drop and stabilize. Adjust VR for the difference to bring up to 13.9 with cap on, replace cap and let temp stabilize. Note reading again.
Example: Battery reads 14.5 volts - need to reduce to 13.8-14.0 - 0.5 volt adjustment for ambient temp of 125°F, remove VR cap, voltage drops/increases, depending upon temp, say to 13.5 volts. Adjust/increase 0.5 volts, replace cap to let VR heat up, check battery voltage - should be close to 13.8-14.0 volts.
For the gauge is it an ammeter? Zero at 12 o:clock? Ammeter - should read to the left of center when engine is off, battery supplying current demanded. If meter reads to the right, swap gauge leads on the back of gauge; now gauge should read to the left indicating a battery discharge with engine off. Once engine starts to run, meter should read to the right of center, battery being charged.
Normal operation at night with headlamps on with other accessories on - more current load - engine idling, gauge may show discharge, reads to the left of center, until engine rpm goes up, then battery gets recharged. Repeats again at next stop light. You might consider replacing the mech VR with a Wells p/n VR715, electronic VR to make alt work alittle harder at idle and less current draw from battery at idle, if equipped with a 37A alternator. Battery takes longer to recharge than it does discharging.
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