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Topic: Generator fuse or breaker location (Read 1534 times) previous topic - next topic - Topic derived from Re: Speedco NIGHTMARE!!!

Generator fuse or breaker location

Does anyone know where the 12 fuse is for the generator. I'm stumped, checked everything I could find, nothing blown or breakers popped. No power to generator, batteries all good.

Thanks,
Larry
Larry & Debbie Town
2000 U320 4210 
Previous 88 GV

Re: Generator fuse or breaker location

Reply #1 –
Perhaps it's with the outside control panel ?
88 Grand Villa 36' ORED 3208 (throwaway)Cat.
 Build # 3150
Happiness is the maximum agreement of reality and desire.

Re: Generator fuse or breaker location

Reply #2 –
Agree with Olde English.

According to the B-2126 diagram linked below, the 12V feed to the generator is unfused between the coach batteries and the generator starter.  Look at control panel on the generator to see if there is a circuit breaker.

If the 12V wire coming into the generator control box is dead, then your problem is somewhere in the wires or connections upstream.  Check wire B39 2OR at both ends for continuity.

The selected media item is not currently available.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Generator fuse or breaker location

Reply #3 –
Had power after starter replacement but only momentarily shorted out the main positive lead to the starter. Checked all main fuses in the bay and all are good. I have not checked the 50 Amp under the bed but will do so tomorrow.  Just sparking a wire should of just tripped or blown a fuse.
The problem is hiding somewhere. More searching to come.
Larry & Debbie Town
2000 U320 4210 
Previous 88 GV

Re: Generator fuse or breaker location

Reply #4 –
Quote from: Chuck & Jeannie –
Agree with Olde English.

According to the B-2126 diagram linked below, the 12V feed to the generator is unfused between the coach batteries and the generator starter.  Look at control panel on the generator to see if there is a circuit breaker.

If the 12V wire coming into the generator control box is dead, then your problem is somewhere in the wires or connections upstream.  Check wire B39 20R at both ends for continuity.

The selected media item is not currently available.
Thanks Chuck, I have power at that stud where those wires are. I sure am better with mechanical stuff on this coach than electrical. I should have power at the generator but there is none.
Larry
Larry & Debbie Town
2000 U320 4210 
Previous 88 GV

Re: Generator fuse or breaker location

Reply #5 –
Quote from: Townrestor –
I have power at that stud where those wires are. I should have power at the generator but there is none.
If you have 12V power at one end of wire B39 2OR (the distribution stud) and there is no 12V power at the other end of the wire (generator starter) then logically one must assume the wire conductor is broken at some point.  Unless, of course, there is some sort of fuse, fusible link, or circuit breaker in that wire which does not appear on the wiring schematic.  Stranger things have been encountered in Foretravel wiring systems..
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Generator fuse or breaker location

Reply #6 –
On many coaches: top of rear large bay wall large 12v breaker panel there are 3 large high amp breakers. Two are self reset and one is manual reset with the manual push button on the "other" side of the wall reached from water bay. You could meter all 3 to be sure there is power on both terminals of each breaker before any attempt at reset. Good luck

Re: Generator fuse or breaker location

Reply #7 –
Quote from: Barry & Cindy –
On many coaches: top of rear large bay wall large 12v breaker panel there are 3 large high amp breakers.
The 3 large breakers to which Barry refers are shown in the B-2126 wiring schematic linked below.  However, even in this diagram (which may not apply to the OP's 2000 model U320) you will notice that the B39 wire to the generator starter is directly connected to the coach battery bank.  There is no fuse or circuit breaker in that circuit.

The selected media item is not currently available.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Generator fuse or breaker location

Reply #8 –
Chuck - there's also a B-2126 for a 2002 in the media section - newer than OP's coach but it might be close.  Note the added complexity where there appears to be a bus bar and a 120 amp breaker labeled "M", which might indicate manual reset, that appears to be in-circuit from the batteries to the generator starter.

The selected media item is not currently available.
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320

Re: Generator fuse or breaker location

Reply #9 –
Quote from: Michelle –
Chuck - there's also a B-2126 for a 2002 in the media section...
Yes - that is the diagram I linked earlier in Reply #2.

I think if you look closely you will see that the 120A breaker does not intercept the wiring to the generator starter.  Cable B11 000 runs from a coach battery positive post to a main power distribution terminal. Wire B39 2OR runs from that distribution terminal direct to the generator starter.  Larry (OP) says "I have power at that stud where those wires are".  I assume he refers to the power distribution terminal (stud).
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Generator fuse or breaker location

Reply #10 –
Quote from: Chuck & Jeannie –
Yes - that is the diagram I linked earlier in Reply #2.

Sorry - missed that.

<insert Emily Litella meme here>
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320

Re: Generator fuse or breaker location

Reply #11 –
Larry,

You say there is no power to generator.  Did you meter the generator starter on the rear side of the generator?

It could have 12 on that terminal without any 12v available anywhere else on generator.

Everyone is commenting on gen starter power.  It could be there.


Re: Generator fuse or breaker location

Reply #12 –
Quote from: Barry & Cindy –
Larry,

You say there is no power to generator.  Did you meter the generator starter on the rear side of the generator?

It could have 12 on that terminal without any 12v available anywhere else on generator.

Everyone is commenting on gen starter power.  It could be there.
Barry, I have power at the positive lug in the bay that feeds the generator but nothing at the positive where the wires come through the chassis to the generator. I had power before I replaced the starter, all I did was arc the positive wire for a nano second. It's a mystery to me but must be another fuse somewhere but shows none on the schematic. Makes no sense.
Larry & Debbie Town
2000 U320 4210 
Previous 88 GV

Re: Generator fuse or breaker location

Reply #13 –
Quote from: Townrestor –
I have power at the positive lug in the bay that feeds the generator but nothing at the positive where the wires come through the chassis to the generator.  It's a mystery to me but must be another fuse somewhere but shows none on the schematic.
Larry,

As I said earlier, you have pretty much deduced the problem.  12V power applied to one end of the wire does not come out the other end.  The wire (circuit) is broken at some point.  You only have two possible ways to "fix" it.  Either trace the wire from one end to the other and find the break, OR, run a new wire.  I guess I would choose the option that seems like the least work.  Up to you!
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Generator fuse or breaker location

Reply #14 –
Quote from: Chuck & Jeannie –
Larry,

As I said earlier, you have pretty much deduced the problem.  12V power applied to one end of the wire does not come out the other end.  The wire (circuit) is broken at some point.  You only have two possible ways to "fix" it.  Either trace the wire from one end to the other and find the break, OR, run a new wire.  I guess I would choose the option that seems like the least work.  Up to you!
I hear you, just hard to believe the wire is now bad when it was just good. I'll have time to figure it out now, been busy all week. Thanks for all the input! Hopefully the gremlin moves on so I can get this thing back together.
Larry
Larry & Debbie Town
2000 U320 4210 
Previous 88 GV

Re: Generator fuse or breaker location

Reply #15 –
Stick a straight pin into cable so it touches the copper inside, at different points and meter the pin.

Re: Generator fuse or breaker location

Reply #17 –
How about maybe there is a fusible link that blew out