Rock Auto still has the SMP mechanical regulator, $35 each. I just ordered two. I’ve been running the Regitar brand electronic regulators that look like the mechanical ones, black box etc, but no resistors on the rear that’s how you know. These absolutely suck. They charge at 15.5 volts above idle unless lights and AC are on. I thought it was bad. Had two more new ones. Installed 1, same thing. I’ll try the old fashioned SMP. Danny Plotkin From: chrysler-300-club-international@xxxxxxxxxxxxxxxx [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx] On Behalf Of John Grady hi Carl , basically you cannot use new regulator on old alternator . Rather than specific wires , here is an understanding how it works : old one you put + 12 v ign directly into regulator , points vibrate to vary the OUT + volts to the field ( + F ) terminal at alternator, it is at whoever value it needs such that ignition wire feeding the old regulator ( and whole car) is held at 13.8 or so . Other end of the old alternator field is grounded inside old alternator . So one wire with varying +V on it . New one , all they had then to go solid state was NPN power transistor , the emitter has to be grounded (-) as base voltage has to be higher + than emitter to turn it on . If wired like old one 12 v through regulator you would need 15 v , ( 14 * .7 “on “ voltage ) to fully do that at 14 V out You don’t have it . So what they Did is put constant 12 v into field all the time ( blue wire to ign * and to one F terminal ) then control the ground end ( green) of field by going through transistor to ground inside silver regulator so two brushes two F . Called “low side switch” No way to use old alternator with that regulator design . ( aftermarket junk tries to , don’t go there) Other blue wire at a mopar silver regulator goes to 12 ignition blue too , that powers the regulator and tells it what the ign voits are . Guy did the right thing big step up —much better setup . The mopar electronic ignition in instructions says not compatible with old setup ( without special 1 wire retrofit regulator ) as vibrating points can cause interference to spark pickup and volt surges (?moderately swinging ammeter is normal as regulator points open and close , flickering headlights too ( ok) although points will burn a bit , that is indication of end of life , swings get large . Maybe 50 k miles . you can file or clean ( must remove bumps) to get it ok — Don’t adjust or lose factory setting of lock screw . So ,on your guy , Carl, — he did a good job , leave that part alone ? What difference does shape of alternator really make in our world? New regulator far better won’t die or go crazy , steady ammeter , better alternator output too , especially at idle . But if keeping the old , keep mechanical regulator too , use one wire from F to regulator , hot side of old regulator goes to ign hot at ballast ( Don’t get wrong end of ballast that goes to coil ) .regularity HAS to be right way around or you instantly blow it up. Grounding field on one wire ( “ to test”) by guy who does not know what he is doing instantly blows it up too . Standard auto parts still selling good mechanical one at Rockauto , black cover etc i bought 4-5 of them before gone , good price too. From above , note you can easily use new 2 wire alternator with one wire regulator just ground the other brush F . Makes it a one wire . PS as you know , you absolutely need vacuum advance , otherwise 6 mpg , and has to be right vacuum advance can for ram motor — . the old J distributor will work BETTER in terms of spark ( no 1 volt solid state internal drop happens with points ) and it has the right fairly critical advance curve for J . Of course , for a 300 lover , checking points is a huge job on a B block every 15 k miles or so ( laugh) . Use dwell meter off ebay , less than 2 minutes ,don’t even lift cap! vs two days trying to figure out intermittent electronic junk ,,wiring and added failure modes . And I am an EE Why Grandma likes the orange box.. or pertronix , great in a Slant six . Adds reliability , loses performance somewhat in terms of output over dual points . We went 140 mph on dual points , Granatelli 190 . john Sent from my iPhone
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