| Author | Message | ||
| captain ron (209.26.134.251)
Rating: N/A |
I know some of you have swiched over to alternator I need part # for alternator to use and wireing diagram. what do you do with old generator and wireing. do you remove it or leave it there and hook up alt in different location. 12volt alt or 24 volt alt? this is for my engine and bus lights not house system. thanks Ron | ||
| TWO DOGS (63.185.81.121) Rating: N/A |
as always...I suggest you get a general motors one wire...you can get a 100 amp. for about 100.00 & 140 amp for about 150.00....all you have to do is run a #8 wire from the alt. to the battery,(and hook it up to an engine pulley),also,from an earlier post,I can get you a spare OR a bunch of wheels to change over from 20" tires,you'd have be over here tho,postage would be too much | ||
| RJ Long (67.181.211.253) Rating: N/A |
Capt Ron - Might help if you let us know what make and model bus you're working on. . . then we can give you a more intelligent answer. HTH, RJ PD4106-2784 Fresno CA | ||
| TWO DOGS (63.185.81.136) Rating: N/A |
he has a 4905 | ||
| captain ron (207.30.240.149)
Rating: N/A |
Thanks 2 dogs, It's a gmc 4905 24 volt system 2d's how will a 12 volt alternater work on my 24 volt system? i have 2 12 volt bateries in series and only 1 wire comeing from a 12 volt alt. please explain I'm toyaly lost on electrical matters. also do I leave the gen. where it is and hooked up or do I need to do some rewiring? by the way I got my tranny in and working hope to get this issue taken care of and back on the road making money by the weekend. | ||
| Gary McFarland (Gearheadgary) (68.79.122.176)
Rating: N/A |
Two Dogs is right, they're cheap and foolproof as long as you are working with a properly sized fool. I think you either need to convert to 12v, or get a 24v 1-wire. Caveat on the 1-wire: If your DC loads get anywhere near the size of the alternator, you could be in a situation where your battery can run down while the engine is running. If your chassis circuit and your house circuit are completely seperate, as you say, You should be fine. Gary | ||
| TWO DOGS (63.185.67.242) Rating: N/A |
UNLESS you run bus air....the diesel uses no elec to run...capt. RON...do you have 24 volt light bulbs in your headlights & taillights ?..I might be wrong,but ,thought 4905 were 24 volt only during start-up...rest of the time they are 12 volt...one wires are the greatest thing that ever happened, I think...it charges the battery when it needs chargeing & shuts itself off when they are charged,internal regulator..almost ALL parts houses have them,....on my 8v71 there is a double pulley in the center of the engine on the front ,just asking for something to do..should be the same on 4905 ...(?)you will have to make brackets,so that it lines up with that pulley..should be abel to find something to'start' with in a junk-yard | ||
| captain ron (209.26.134.92)
Rating: N/A |
my head lights are 12 volt my tail lights and brake are 24 volts. I would like to convert them to 12 with new lights. so your saying I can run 1 wire to one battery and that would be sufficient? don't want and can't afford any more mistakes or break downs | ||
| Gary McFarland (Gearheadgary) (68.79.122.176)
Rating: N/A |
One thing to consider, when you cut the voltage in half, you double the amperage. You may encounter wiring that is too small for 12v. Sounds upside down, huh? Headlights/Taillights are mousenuts. You will have to replace the Starter ($) and what else? (I don't know nuttin 'bout no 4905's) Gary | ||
| TWO DOGS (63.185.67.242) Rating: N/A |
really...you need to talk to brown booties (don ks/Tx)....I KNOW everything would work on 12 volt...hard to say "HOW" to do it from here ..ya' really need to talk to an elec. | ||
| TWO DOGS (63.185.80.101) Rating: N/A |
starter is fine,no need to change it...just got to find somebody to wire it up correctly.. | ||
| guy bouchard (161.184.177.136) Rating: N/A |
On a 4905 you have to check to make sure that your regulator isn't fried. The Alternator on them is nearly bullet-proof. All that you need to do to fry the regulator is to boost start with a boost setting on a charger---been there done that. The regulators are about $50.00 in Can. Guy 4905 | ||
| TWO DOGS (63.185.80.101) Rating: N/A |
he said he had a generator.....unless I missed something..might have...it's late,time for the fat boy to shut it off | ||
| Gary McFarland (Gearheadgary) (68.79.122.176)
Rating: N/A |
How do you drive a 24v starter with 12V? Gary | ||
| TWO DOGS (63.185.97.251) Rating: N/A |
with a little steering wheel gary  | ||
| Gary McFarland (Gearheadgary) (68.79.122.176)
Rating: N/A |
LOL. Very good. I had to read that five times to get it. Gary | ||
| Jim-Bob (12.46.52.74) Rating: N/A |
Ron, I think you need to stay with 24 volts. As you know, I have a 1976 4905. Except for the headlights,(which originally were 24 volts) everything else is 24 volts on the 4905. It does not "start on 24, then go to 12 volts" and you can not power a 24 volt starter on 12 volts (properly). All of your relays, Skinner valves, blowers, etc are 24 volts too. As was said, the 4905 should have an alternator about the size of a watermellon which is an excellent gear driven, sealed, oil cooled unit that doesn't even have brushes. (It has an exciter system like an AC genset) It was designed to run flat out 24/7 supporting the air conditioning and the lights for 49 people. It IS more likely that your regulator is gone. A good starter/alternator shop should easily be able to diagnose the problem & get you going. Hope this helps, Jim-Bob | ||
| Gary McFarland (Gearheadgary) (68.79.122.176)
Rating: N/A |
Sounds like keeping the 24v might not be a bad idea. Besides, I can sell you all the 24v stuff I have GAry | ||
| TWO DOGS (63.185.64.9) Rating: N/A |
o.k. stay with what Jim Bob says...that all sounds correct.. | ||
| captain ron (209.26.134.150)
Rating: N/A |
I checked my generator or alternator which ever it realy is and one stator is bad there are 3 along with 3 sets of diodes which I believe are ok I have to remove a clothes dryer in my front bay so I can get to my volt reg. to check it. I found a 24 volt alternator on line for about $300 it is for a catepillar or similar dozer or other heavy equipt. but is only 20 or 25 amp. is that ok? and do I need to worry about rotation? what is my motor left or right rotation? 8v71 1970 4905 | ||
| FAST FRED (4.245.212.96) Rating: N/A |
Confusion arises becaue GM calls alternators , generators in some of Da Book's. IF the V reg is fried it might be better to get a 3 or 4 stage reg from the alt energy folks. At least those regs have a float setting , most GM V reg are simple minded and maely hold set volts , regardless if the batt is in need of a charge or being boiled. FAST FRED | ||
| captain ron (209.26.134.150)
Rating: N/A |
by the way. when I said I was going to switch to 12 volt I only ment lights and such not every thing. I'm not rich and I'm getting poorer every day | ||
| Jimmci9 (209.240.205.68) Rating: N/A |
fix what you have....instead of adding more stuff...gm engineered it... unless you only need it for starting, and lights... if you don't plan on having a battery bank for interior coach use, then remove it... cover up the hole and put a smaler belt driven 1 on... i can beat the $300 alternator..(i work for a detroit/allison dealer now)... jimcat2@webtv.net | ||
| captain ron (209.26.134.246)
Rating: N/A |
I found a24 volt alt on ebay item# 3827713851 any avdvice on this unit and is this the same as you are talking about jimmy? | ||
| Tom Caffrey (Pvcces) (65.74.66.104)
Rating: N/A |
Captain Ron, I noticed that nobody commented on the use of an 8 gauge wire to go with an aftermarket alternator. That wire is only rated for 60 to 80 amps, if the ambient temperature is 86 degrees. When the temperature climbs to 170 degrees, the best you can hope for is 33 amps. I am using the figures furnished in my Pocket Ref by Thomas J. Glover. It will work surprisingly well in something that does not have big battery banks or big loads, because the alternator output normally drops off so quickly after the engine is started and well before the engine compartment gets really heated up. However, if you want to use the full power of a 100 amp or 150 amp alternator for any amount of time in a hot compartment, you will need a much larger wire. Acccording to the Pocket Ref, a 1/0 gauge would be needed for the 100 amp and it would take a 3/0 gauge for the 150 amp unit, if the ambient temperature were to reach 159 to 176 degrees. From this, it is easy to see why our 220 amp 12 volt generators came with 4/0 wire connected to them and why later coaches were 24 volts. Good luck. Tom Caffrey PD4106-2576 Suncatcher |