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PT & WB (Twin Axle Pusher Unique Issues) If you have a unique issue with your PT or WB model coach and it can't be answered in one of the other forums here, then this is where you can list it....list your PT Parts here too.

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  #1  
Old 06-28-2012
Dennis&Ella Dennis&Ella is offline
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Default Help with alternator

I have my 89pt40 at Coachworx for some repairs. They tell me my lower alternator is bad and want to install a 270 amp alternator that costs $1200 and replace 02 bad batteries. My coach has 2 130 amp alternators on it.The price and amps seems pretty high compared to what some of you are using. Do I really need a 270 amp alternator? I was thinking of bringing the coach home and replacing the batteries & alternator myself. It is a 2 hour drive to the house.
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89 WB40
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Old 06-28-2012
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alvahall alvahall is offline
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Dennis, I've changed my alternator and it's not that bad a job. If you have one good alternator, you'll be fine driving home. If neither worked, you could run the generator to keep the batteries charged.
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1988 Narrow PT40
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Old 06-28-2012
Dennis&Ella Dennis&Ella is offline
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Changing the alternator will be no problem for me. I just couldn't imagine why I would need such a big alternator on my coach while others are running 160's.
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Old 06-28-2012
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alvahall alvahall is offline
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Were they planning on eliminating one of the alternators? You certainly don't need a 160 and a 270. Why not have the bad one rebuilt?
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Last edited by alvahall; 06-28-2012 at 11:19 AM. Reason: typo
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Old 06-28-2012
Dennis&Ella Dennis&Ella is offline
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They were going to keep both alternators. I can pull it out & see if the local alternator shop can repair it. They also want to install a 4 post battery isolator between the main bank batteries and the generator battery. I recently installed the Blue Sea relay & removed the diode.
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Old 06-28-2012
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sfedeli sfedeli is offline
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Dennis- if you have the Blue Sea relay, you do not need an isolator between the house and genny battery. That would be redundant. Isolators are notorious for voltage drop. If you have house and engine batteries, that is another story. Is your main bank split? If so, I would think it's OK to keep them separated, since the engine batteries get charged (and used) only when you are driving.

A 160A Leece-Neville J-180 mount sells for around $300 new. That's what we put in Jim Nichols' '93 Wide Body earlier this year and it worked fine.
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Old 06-28-2012
Dennis&Ella Dennis&Ella is offline
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Shane - I talked to the the mechanic who is working on the coach. He wanted to remove the relay and mount the isolator behind the front bumper and run new cables from the back of the coach to the isolator. My main bank is not split. I plan on replacing the bad alternator with that alternator, I just need to make sure the mount is the same. The mechanic is questioning why 2 alternators are there, thinking they are working against each other. Apparently some of the coaches have a 1/2 switch on the dash to use 1 alternator at a time, mine doesn't have one. I have told them not to do the electrical work. I am picking up the coach & will repair the electrical myself.
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Old 06-28-2012
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Randy Dupree Randy Dupree is offline
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New alternators are available at Frieghtliner.
Get new,not rebuilt,new is cheaper and better.
Remember the alternator is driven by fan belts,the more the amps the more power it takes to drive the alternator.
Belt life needs to be considered.
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Old 06-28-2012
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Quote:
Originally Posted by Randy Dupree View Post
New alternators are available at Frieghtliner.
Get new,not rebuilt,new is cheaper and better.
Remember the alternator is driven by fan belts,the more the amps the more power it takes to drive the alternator.
Belt life needs to be considered.
In addition, to what Randy said, your existing wiring may not be up to task of the bigger alternator with that big of a jump in amperage. (More than double the size)
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Old 06-28-2012
Dennis&Ella Dennis&Ella is offline
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I am going with a 160 amp alternator, the same one that Shane was talking about. The shop wanted to put in a 270 amp but I don't see the need to go that big. The original alternator is a 130 amp.
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