Accessory vs Battery Voltage - TESTED
My initial take on the matter:
Took my little voltmeter and tested the voltage readouts at the accessory leads in the headlight bucket and the voltage at the battery terminals. Pic attached.
Result: the voltage reads the same at both ends. 12.5 V from both ends.
Updated result: I am a big fat liar! I tested it again with a multimeter and there IS a voltage drop, which may be due to a MOSFET R/R because the charging is being taken out of the junction box
After switching to a MOSFET my voltage meter was consistently reading 13.5v at full engine speed, and dipping as low as 11.0 when idling at stops with the voltmeter wired through the accessory leads in the headlight bucket.
After rewiring the voltmeter directly to the battery I am getting 14.0v at speed and 12.4v at idle (no charging at idle, expected with a stock stator to some extent, though not desirable)
tl;dr - If you're adding a voltmeter it is best to wire it directly to the battery terminal leads if you want accurate voltage readouts, especially if you run an aftermarket R/R
ignore the attached image. It represents the electrical system at rest, not under load/charging
Last edited by ubertalldude; 06-29-2017 at 04:31 PM.
Reason: I was wrong, there IS a voltage drop