I have disconnected the internal wires from my Automatic Sprinkler Timer model R8806P 101C . and don't know where they are supposed to go. Is there a diagram of that? Specifically, where does the black wire from the manual on/timer auto/off go? To the relay or the 'hot' wire block on the bottom? Thanks, Ed

You have 120Volt Intermatic sprinkler timer with 24Volt output.
Copy following link for setting sprinkler timer:
http://waterheatertimer.org/pdf/How-to-Set-and-Troubleshoot-Intermatic-sprinkler-timer.pdf
Copy following link for wiring Intermatic sprinkler timer:
http://waterheatertimer.org/How-to-wire-Intermatic-sprinkler-timers.html
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Maybe the sprinkler head is not advancing.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Identify timer and download manual at following address:
http://www.orbitonline.com/support/guides/Manualsearch3.cfm?Brand=02&Type=Timers

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Timer is not identified.
Voltage is not known.
Is this a new timer installation, or older timer that worked before.
Problem cannot be solved without knowing timer model number and voltage, and if timer worked before or if this is new timer.
Read information below, and then add a comment with missing information.

Sprinkler timers have a replaceable toggle switch.
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#sprinkler
T100 series timers have manual override lever.
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html
http://waterheatertimer.org/pdf/How-to-operate-and-set-T104-timer.pdf

You have Intermatic 240Volt sprinkler timer.
http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/r8816p101c%20-%20english.ashx

Timer relay has 4 wiring terminals: from left to right 1 2 3 4
Red wires from switch connect to terminals 1 and 3
Red wires to pump connect to terminals 2 and 4
Since circuit is 240Volt, red wires from switch can be connected in either order. Same with pump.

Rain sensor terminals don't have any wires, unless you but separate rain sensor.

Parts:
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#sprinkler

Open following links for resources:
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#sprinkler
http://waterheatertimer.org/images/T8845PV-image-700.jpg

If you have 2 hot wires, then you have 240Volt circuit from breaker box.
T8845PV is 120Volt timer.
How to wire for 120Volt: Use one hot wire to connect to LINE terminal. Cap off other hot wire. Then connect bare ground wire to terminal marked NEUTRAL.
This is not code, but it will work until you have time to run 120Volt line from nearby 120Volt outlet.
Read about 120 and 240Volt circuits
http://waterheatertimer.org/B220C.html

T8845PV is 120Volt timer, made to control 24Volt sprinkler valve.
Inside the timer, there are two wiring terminals marked LINE and NEUTRAL
120Volt cable from circuit breaker has black hot wire and white neutral wire.
Connect black hot to terminal marked LINE
Connect white neutral to terminal marked NEUTRAL

The yellow wires are 24Volt output.
Yellow wires connect to sprinkler valve.
Do not connect 120Volt to yellow wires.
This timer does not have terminals for rain sensor:
http://waterheatertimer.org/pdf/How-to-Set-and-Troubleshoot-Intermatic-sprinkler-timer.pdf

If the dial does not rotate but manual override works, then the timer is wired incorrectly or polarity of line is reversed or you are connecting to 240Volt line instead of 120V.
1) You have wires from breaker box reversed with wires that goes to sprinkler solenoid. Switch black wires and see if that corrects problem.
2) Check that breaker supplying voltage is 120Volt.
3) Test if black wire from breaker tests 120V to ground wire, and test that white wire from breaker tests 0 volts to ground.

Open following links for additional troubleshoot and parts:
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#sprinkler

Three things to look for:
1) If sprinkler turns on-off but doesn't advance to next zone, then Sprinkler Valve is suspect, and timer is good.
2) If sprinkler stays on all the time, or never turns on, then Timer is suspect.
3) If sprinkler turns on-off, but leaks when it's supposed to be off, then Sprinkler Valve is suspect, and timer is good.
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#sprinkler

Open following links for parts and manual.
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#sprinkler
http://waterheatertimer.org/pdf/r8806p101c-instruction-manual.pdf

1) You can buy replacement parts and fix old timer using part numbers shown on link above.
R8806P is 240Volt timer

2) If you buy new timer, insides of timer can be replaced without changing the box.
Snap out old timer mechanism using thumb spring located top inside timer.

3) When replacing wiring, take photo of wiring on old R8806P10 and then hook up new wires same way on new R8806P10. Wiring is as follows: 2 hot wires from breaker connect to far left terminal and terminal second from right. Load wires connect to other two terminals. Since this is 240V, the either color wire can connect.

Intermatic manuals
http://www.intermatic.com/customer%20service/instruction%20manuals.aspx

R8806R101C manual is not shown on Intermatic, even among discontinued models.
But product is still for sale.

R8806P manual is available:
I suspect manual is very similar since it's a mechanical time piece. If not, then add a comment with specifics and I will help.
120V:
http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/r8815p101c%20-%20english.ashx
240V
http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/r8806p101c%20-%20english.ashx

R88 series sprinkler timers: click model number to see manual
http://www.intermatic.com/products/timers/mechanical%20time%20switches/sprinkler%20irrigation%20timers.aspx