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MEP-803A genset no crank

jaybird67k

Active member
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Texas
i just aquired a MEP803A with 45 hours on it. Bought 2 new batteries and get no crank from either locations. No prime also. The green lights come on with no prime pump and no crank. Jumped the solenoid and it spins. I also get no test lights except for battle and circuit open or closed lights. The start relay is engaging and I have 25v at starter.
Any help would be greatly appreciated.
Thanks, Jason
 

Ray70

Well-known member
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West greenwich/RI
By " both positions" I assume you mean the dead crank switch and the S1 start switch?
I's start by confirming your E-stop switch is pulled out, the 7.5A circuit breaker inside next to the F1 alternator charging fuse is pushed in and if those all check out, verify the CR1 diode on the panel in the rear left side of the control cube has continuity through it.
Your description sounds more like no power to the control panel than a no crank situation, although it sounds like your saying the cranking relay is engaging?
It sounds by your description like you have no gages, no fuel pumps, no warning lights as well as no cranking.
Do your panel illumination lights work, or are they dead as well?
Might also want to take a look at the TM, or engine side door on the machine for the wiring schematic.
Look at both the S10 dead crank switch, the S1 main switch and the K2 cranking relay, that shows you the path that power takes when cranking from the dead crank or main switch.
 

jaybird67k

Active member
103
25
28
Location
Texas
By " both positions" I assume you mean the dead crank switch and the S1 start switch?
I's start by confirming your E-stop switch is pulled out, the 7.5A circuit breaker inside next to the F1 alternator charging fuse is pushed in and if those all check out, verify the CR1 diode on the panel in the rear left side of the control cube has continuity through it.
Your description sounds more like no power to the control panel than a no crank situation, although it sounds like your saying the cranking relay is engaging?
It sounds by your description like you have no gages, no fuel pumps, no warning lights as well as no cranking.
Do your panel illumination lights work, or are they dead as well?
Might also want to take a look at the TM, or engine side door on the machine for the wiring schematic.
Look at both the S10 dead crank switch, the S1 main switch and the K2 cranking relay, that shows you the path that power takes when cranking from the dead crank or main switch.
The green panel lights do come on. I replaced a 2 amp fuse that was bad behind the control panel under the 7.5amp push in.
 

jaybird67k

Active member
103
25
28
Location
Texas
That is your battery charging fuse and should be 30A not 2A, but that should have nothing to do with your problem.
Can you confirm you get the same results with both the dead crank and main S1 switches?
Dead crank and panel crank same results.
 

kloppk

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Steel Soldiers Supporter
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Location
Pepperell, Massachusetts
....The start relay is engaging and I have 25v at starter....
I assume when you say "starter relay" you are referring to relay K2?
If so, you'll want to see if terminal A1 on it is getting 24 volts all the time.
Then check terminal A2 for 24 volts when you try and engage the starter from the Dead Crank Switch or S1.

You may have multiple issue since the Primary Fuel pump doesn't run.
 

jaybird67k

Active member
103
25
28
Location
Texas
I assume when you say "starter relay" you are referring to relay K2?
If so, you'll want to see if terminal A1 on it is getting 24 volts all the time.
Then check terminal A2 for 24 volts when you try and engage the starter from the Dead Crank Switch or S1.

You may have multiple issue since the Primary Fuel pump doesn't run.
Thanks. Do I check voltage with relay still installed or pull it out and check the pin slots?
 

Guyfang

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First I would suggest that you download the TM's, and start reading them. Then you will know where such things like K2 hide in the set. And how to get at it. Might not hurt to take a few pictures of the control panel, the inside of the control panel and maybe the S10, (dead crank ) switch. Perhaps we can see things you dont know about yet.
 

jaybird67k

Active member
103
25
28
Location
Texas
First I would suggest that you download the TM's, and start reading them. Then you will know where such things like K2 hide in the set. And how to get at it. Might not hurt to take a few pictures of the control panel, the inside of the control panel and maybe the S10, (dead crank ) switch. Perhaps we can see things you dont know about yet.
It came with manuals but what is this TM you speak of?
Thanks, Jason
 

Guyfang

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Staff member
Moderator
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Burgkunstadt, Germany
TM = Technical Manual. The TM's that came with your set may not be newer than what is in the TM forum. You should go to the Generator TM forum, down load the TM's there and compare them. And then spend some time reading the operators TM.
 

jaybird67k

Active member
103
25
28
Location
Texas
TM = Technical Manual. The TM's that came with your set may not be newer than what is in the TM forum. You should go to the Generator TM forum, down load the TM's there and compare them. And then spend some time reading the operators TM.
I found my problem I believe. This unit sat in a field on a pallet for a year since last run. A rat built a nest and chewed close to 20 small wires so I'll be fixing them and go from there.
 

Attachments

Guyfang

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Staff member
Moderator
16,896
24,484
113
Location
Burgkunstadt, Germany
I once helped get a 1 million dollar radar ready to go back to Mama Raytheon. Mice got into it in the winter. Total loss. 1 million bucks. The wires all over were chewed through. At last, a mouse got caught in the Magnatron, and the radar burned like a camp fire.
 

peapvp

Well-known member
Steel Soldiers Supporter
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Location
Basehor, KS
I once helped get a 1 million dollar radar ready to go back to Mama Raytheon. Mice got into it in the winter. Total loss. 1 million bucks. The wires all over were chewed through. At last, a mouse got caught in the Magnatron, and the radar burned like a camp fire.
@Guyfang
Wait until @Light in the Dark ‘s Russian Field Mice get in there….

Maybe we should send some of those Magnatron’s to the Ukraine
 
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