m1028 Dual 28 volt alternators

[taylorbsmith]

I have searched previous threads and it is not totally clear so I am going to have to ask. I have a M1028 with the dual 28 volt alternators (duvac). I have found that the bottom alternator is bad. Is it possible to do without the bottom alternator since it runs the rear a/c (which is no longer on the truck) and connect both batteries to the top alternator and keep the 24 volt system. Please give me some feed back or possible solutions. Thanks

 

[Keith_J]

There WILL be an issue since the truck's hotel loads are handled by the front battery alone. These would be all lights, the blower fan and the few sensors. The issue will be the front battery being discharged while the rear battery is overcharged.

Now if you ran the 12 volt loads off a 28 to 14 volt converter that can swing 40 amperes, you will be fine to go without the Duvac unit and both alternators.

I would recommend fixing the issue, the Leece Neeville alternators can be rebuilt and parts are available.

 

[lavarok]

You should be fine with just the 24v TOP alternator and everything should work as long as your duvac is working.

Edit :

** You should not have to rewire anything ** Just remove the bottom alt and wires for bottom alt. If your duvac is working, it will do what is needed to cover both the 12v and 24v systems. However, sooner or later the DUVAC will fail. So if your not using 24v consider removing both 24v alts and converting the truck to 12v.