mep-802a no start from main start switch

[customload]

cr1 had 24+ on the voltage
cr2 had zero

 

[customload]

you lost me with see post 18

 

[kloppk]

Sorry...

Do you measure 24 volts on both leads of CR1?

 

[customload]

yes 24+

 

[kloppk]

Hmmm... Do you have a copy of the schematic? If so are you familiar with how to follow it?

 

[customload]

Have wiring diagram, not an electrical guy though.
I know how to build houses, but will try almost anything.

 

[kloppk]

Gotcha...
Seems odd you have +24 on both leads of CR1 but don't get 24 volts to diagnostic connector pin T when you have it the dead crank in the Crank position.

 

[customload]

My Fault.
Re read what you said and used smaller pin in socket.
Only got under 4 volts in all three pins, X-T-N

 

[kloppk]

I assume you got the 4 volts with the dead crank in the Crank position - right?

If so go back to CR1 and measure each lead on it when you put the dead crank switch into the CRANK position and let me know the readings.

 

[customload]

Dead crank switch in the center, 24.5 left side cr1 and 24.9 on the right
Dead crank down to run position, 23.8 on left side 24.6 on the right
Dead crank in the up position to crank, 23.9 on the left, and 24.7 on the right.

 

[kloppk]

In you first post you indicated you replaced the crank relay. Was it the one that looks like al old fashioned car starter relay? Round can mounted on it's side with two large posts and 2 small posts?

 

[customload]

What about the master switch I mentioned.
This unit had a DHR10, not a CHR10
could that be anything.

 

[customload]

Yes, with some part, new.
It clicks when I push the dead crank up or turn the master switch to run position.
Large wires go tot eh glow plug and the starter soliniod.

 

[kloppk]

What about the master switch I mentioned.
This unit had a DHR10, not a CHR10
could that be anything.

Nope. The dead crank switch should bypass that.

 

[Guyfang]

Download the TM's. They are here in the TM section. All the TM's you need to fix this problem. Start with the troubleshooting diagram. First troubleshooting problem is "SET FAILS TO CRANK". I guarantee you, if you use the books and take your time, you will find the problem. Had you used the troubleshoting diagram, you would know what the voltages mean, that you listed in message #30, and would not have to ask someone else.

 

[kloppk]

Yes, with some part, new.
It clicks when I push the dead crank up or turn the master switch to run position.
Large wires go tot eh glow plug and the starter soliniod.

Relay K18 in there is for the glow plugs only.
Relay K2 is the starter relay.

 

[customload]

Thank you for your time.
I will try to make sense of the TM.
You have been very helpfull.

 

[customload]

Sir I have cycled the switch.
Are there any avanues for service around here?
Im in Williamsburg and it shows you in Northern Va.

 

[Lawman21]

I have 2 Mep 802's both fail to start at the the switch. Dead crank turns over on both relays work but fail to start any quick fix need to use these soon. Yes dis look at the TM downloaded and printed and spiral blind them.for easy reference

 

[Dwnorton1]

View attachment DC circuit breaker.pdf
Without any more info this would be first thing I would check to see if I had 24VDC to both sides of circuit breaker indicated in drawing. Should be fully depressed. Also there is fuse directly below that may be missing/blown.