Jomorisn

The A/C used to work fine in this truck but something hap[peded lately, When my air conditioner is on the fan on the engine doesn't engage and compressor short cycles if I unplug the wire to the left of the radiator the fan engages and it stays engaged and the compressor seems to run longer with the fan engaged. Is  there clutch fan is there a relay that controlls the engine fan? Also is there a relay next to the APAD? 

Thanks in advance for any and all help

I will check the headlights work fine it I have no dash or running lights cab lights marker or tail lights I read there’s a pressure switch that can cause this problem but the headlights still work at a loss here I will chase the harness this weekend 

Thanks John

I did replace the relay and still have the same problem not sure where to go next any and all help is great thanks in advance

I cleaned all grounds and still have the issues. Maybe bad speedo?

I have a 20032 CH613 the dash lights and headlights running lights stopped working. Is there a relay for these?

Thanks in advance any and all help is apreciated.

thanks John

Vmac3,

Is the communication connector the green and yellow wires? And thank you for your reply.

Thanks John

I have a 2002 CH 600  with a 427 it has started with this problem of not  starting or stalling when driving and sometimes starts right up and today it would not start for 45 mins and sometimes run for weeks with out an issue

It shows codes 6 and 4  and the dash displays No Info it died today sat for about 45 mins fired and I was on my way . Could it be a bad ECM? overheating cooling and then starting back up when it cools down?  I have posted this before and have cleaned all grounds and my isssue continues   I don't think its a harness problem any and all help would be great thanks in advance Thanks Sick CH

I have a 2002 CH 600  with a 427 it has started with this problem of not  starting or stalling when driving and sometimes starts right up and today it would not start for 45 mins and sometimes run for weeks with out an issue

It shows codes 6 and 4  and the dash displays No Info it died today sat for about 45 mins fired and I was on my way . Could it be a bad ECM? overheating cooling and then starting back up when it cools down?  I have posted this before and have cleaned all grounds and my isssue continues   I don't think its a harness problem any and all help would be great thanks in advance Thanks Sick CH

I have a 2002 Mack CH 2002 427 it will run fine for weeks and then start stalling not starting until it sits for a while then start and stall lately will not stay running and I can't use the truck. it will show No Info on the dash and also throw 6-4 code  I have cleaned all grounds that I could find. Can the VECM or the VECU cause these problems. Any and all help would great 

Thanks John

I have cleaned most of the grounds

and will cleanup the rest. Thanks for taking the time to answer my post.

 I really appreciate it I will let you know how I make out.

 Thanks again John

I have a pair they on my Peterbilt now I will be changing to hub piloted and will message you when they are off in a month or so if you’re interested  

Thanks John

My speedometer works fine until I turn on my head lights then it reads high if i shut the  truck off and lights  and start up it works fine.

Thanks in advance john

Does anyone know what the black junction block with 2 stud with wires attached next to the starter solenoid is called and what does it do

Thanks in advance John   

What is the J1939 link and when do i find it 

Thanks in advance John

My CH throws 6-4 code what is the J1939 link  and where do I find this any and all help would be great

Thanks john

Brett,

Is the 1939J a wire or harness?

I have a 2002 CH600 E 7 427 with the stalling issue but sometimes won't start for 45 mins other than the stalling runs fine. it was codes 6 and 4 that flashed but now it won't show any code do they reset themselves? Any help would be great thanks in advance

I have a 2002 CH 600  with a 427 it has started with this problem of not  starting or stalling when driving and sometimes starts right up and today it would not start for 45 mins.

It shows codes 6 and 4 it died today sat for about 45 mins fired and I was on my way . Could it be a bad ECM? overheating cooling and then stating back up when it cools down?  I don't think its a harness problem any and all help would be great thanks in advance Thanks Sick CH

I have a 2002 CH 600  with a 427 it has started with this problem of not  starting or stalling when driving and sometimes starts right up and today it would not start for 45 mins.

It shows codes 6 and 4 it died today sat for about 45 mins fired and I was on my way . Could it be a bad ECM? overheating cooling and then stating back up when it cools down?  I don't think its a harness problem any and all help would be great thanks in advance Thanks Sick CH

I have a 1999 RD690S  just turned 418,000 miles with a 25 foot rack body with removable sides with a 5500 LBS capacity lift gate 44,000 rears 14,300 front E 7 300HP

6 speed trans and double frame excellant runs good  get in go to work $18,000 or BO Call 603 231 1345 if you have any interest thanks John

I'm looking at 1999 RD 690S trying to find the engine and axle  specs on this truckVin # 1M2P289C7XM029160 thanks in advance John

I have a bracket from the rightside if you’re still looking.

 Thanks John 

On 12/22/2017 at 9:58 PM, polracer01 said:

Try key switch or regulator under dash above the glove box or we had one this summer where we changed out all the ground bolts from on the block ground the alternator engine block and cab grounds... the later was doing the same thing yours is be charging fine then volt meter would drop off

 

 

Is that the one that looks like  Ford starter solenoid ? Thanks for your reply John

I have replaced the switch and still the problem but thanks for your reply John

On 12/22/2017 at 9:40 PM, mackey58 said:

Maybe a bad key switch? 

My 1990 RD 690S the volt gauge will drop like you shut the key off and then sometimes it will go back to charging properly sometimes if I turn the key on and off it will not like all the power to the cab is off even though the key is on  any and all help would be great thanks in advance John