chevymike
Well-known member
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- San Diego, CA
Hi guys,
Okay, so I have been reading SS for the last month (well before I got my M1010) and know there are a number of issues with the DUVAC system and charging on 1010's in general. There seems to be a number of different solutions on removing this troublesome system. Also a lot of reference to TM's for troubleshooting.
So today, after gettting both batteries charged up (holding 12.8 volts after 24 hours from being charged), removed all the connections from the DUVAC system and cleaned them. Put some dielectric grease on them during reconnection. It does have the "orange" wire conversion and the battery voltage is the same at the battery and at the end of the orange wire at the DUVAC. Zero voltage drop so my connections should be good.
Here is what is happening. When running, I am getting 27.4 volts across the two batteries and from the output post on the lower alternator. When I check the voltage at the front battery, I am only getting 10.4-11 volts when running. I get this same voltage at the upper alternator output post. I know this is not right and it should be the mid 13 to low 14 volt range.
Now the question I can't seem to find easily answered (as the TM's want you to test the alternators off the vehicle) is, what voltage should I be seeing on the upper alternator output post? Should it be closer to 28 volts or 14 volts when running?
I have also checked all the fuses on the fuse block (test light) and get power to all of them depending on ignition switch or master switch setting. I checked this as I had found others running into weird issues when some of those fuses were blown.
I ran out of daylight and couldn't check to make sure the 3 diodes by the DUVAC are working.
Sorry this is long winded but I really wanted to make sure that it is known that I have been testing/reading/checking everything I can come across and not just posting up without doing my homework.
Thanks for your help and hope someone knows what the upper alternator output is.
Okay, so I have been reading SS for the last month (well before I got my M1010) and know there are a number of issues with the DUVAC system and charging on 1010's in general. There seems to be a number of different solutions on removing this troublesome system. Also a lot of reference to TM's for troubleshooting.
So today, after gettting both batteries charged up (holding 12.8 volts after 24 hours from being charged), removed all the connections from the DUVAC system and cleaned them. Put some dielectric grease on them during reconnection. It does have the "orange" wire conversion and the battery voltage is the same at the battery and at the end of the orange wire at the DUVAC. Zero voltage drop so my connections should be good.
Here is what is happening. When running, I am getting 27.4 volts across the two batteries and from the output post on the lower alternator. When I check the voltage at the front battery, I am only getting 10.4-11 volts when running. I get this same voltage at the upper alternator output post. I know this is not right and it should be the mid 13 to low 14 volt range.
Now the question I can't seem to find easily answered (as the TM's want you to test the alternators off the vehicle) is, what voltage should I be seeing on the upper alternator output post? Should it be closer to 28 volts or 14 volts when running?
I have also checked all the fuses on the fuse block (test light) and get power to all of them depending on ignition switch or master switch setting. I checked this as I had found others running into weird issues when some of those fuses were blown.
I ran out of daylight and couldn't check to make sure the 3 diodes by the DUVAC are working.
Sorry this is long winded but I really wanted to make sure that it is known that I have been testing/reading/checking everything I can come across and not just posting up without doing my homework.
Thanks for your help and hope someone knows what the upper alternator output is.