Where might the 12V. reg be hiding ?

[bs4104]

Where might the 12V. reg be hiding on a 90-94 PreVost, Country Coach conversions.  It has 24V 75A. belt driven alternator at the rear bumper  & 12V D50 large alternator on the back of the bell-housing. Where might the 12 Volt REGULATOR be mounted? Bruce

[Chopper Scott]

I would have no idea except that it may have an internal regulator. Just a thought.

[Ray D]

oops, ignore post, I didn't see you were looking for a 12v regulator

Ray D

[Sean]

No way to know without following the wires, unless someone here is a CC expert.

Prevost would have built the coach stock with a 24v, 50DN gear-driven alternator and no 12-volt alternator at all.  The setup you describe is specific to the CC conversion -- either CC did it themselves, or they custom-ordered the shell with the weird setup.  In either case, the regulator will be wherever CC wanted it put.

Also, I don't know what a D50 alternator is (my search only turns up a Dodge part, which I would guess is not what you have), but if it is an aftermarket unit that CC bolted on, there is a chance it is a "one-wire" type as has already been suggested, which would be internally regulated.

-Sean
http://OurOdyssey.BlogSpot.com

[JackConrad]

Since he said the 12 volt alternator was on the bell housing, maybe he meant 50DN alternator?  Jack

[bs4104]

Yes it is a 50dn. I will try call Dick Wright about it. Just didn't want to take the whole buss apart looking for it just to adjust it.  thank All   Bruce

[Sean]

Bruce,

Again, it is going to be wherever CC wanted it.  The stock Delco regulator for the 50DN when it was 24v for the chassis would have been right above battery #2.  However, since this 12v alternator is charging the house batteries, I would not guess CC to have left it there.

The most likely place for it is in the house battery compartment.  You should find the regulator "sense" lead connected directly to the battery positive post, or to the first bulkhead connector in the positive cable.  The sense lead will be relatively small, no larger than #10.  That wire should lead you directly to the regulator, which is a black box with shallow fins, about (going from memory here) 4"x8"x1.5", with three terminals on one end and an adjustment set screw right in the middle.  You can also trace the wire from the alternator field terminal to find it.

Give Dick a call -- he might just know where CC mounted the regulator, because he's not all that far from them, and he might have had a couple of their conversions through his shop.  But by the same token, he might not -- if he's never worked on that particular model conversion, he would have no way to know.

-Sean
http://OurOdyssey.BlogSpot.com

[RTS/Daytona]

many buses have the regulator mounted in the BOX COMPARTMENT - you might look there

[bs4104]

It was in the DELCO REMY alternator models 32 SI model 1117183 this is a 85A 12 V. Delco Ramy web had no info about it will call them Monday Bruce

[bs4104]

add photos above     Thank All   Bruce

[Sean]

Bruce,

As I am sure you now realize, the 32SI is very different from the 50DN.

The 32SI is an internally regulated alternator.  The regulator is NOT user-adjustable, voltage set-point is 14.2 volts.

Remove all loads from the system except for the batteries themselves.  Make certain the batteries are good; if you have any doubts, borrow a known-good 12v battery and use this for the test.

With the engine on high idle and the alternator spinning, measure the voltage directly at the output terminal of the alternator.  If it reads below 14 volts, either the internal regulator is bad, or there is another problem with the alternator.

If the alternator tests good but you are still getting lower voltage elsewhere in the system, you have a different problem.

OEM-compatobe aftermarket replacement regulators are available for this alternator; no need to spring the big bucks for the Delco part if the regulator turns out to be bad.

-Sean
http://OurOdyssey.BlogSpot.com

[bs4104]

The unit was not charging at all. I didn't know what alt. was on it till I pull up the bed this morning, was only looking for the Reg. to check where the problem might have been. The out put terminal was melted & shorting out part time to the alt. frame. Will pull in out & have repaired I hope.  Bruce