Looking for switched positive on L190, also cluster says "ACC"

[speed_demon]

I'm installing an auxiliary heater in my 2008 New Holland L190 and I'm trying to find the best place to get switched positive. This fan runs at 5amps with a 15amp fuse. There is a port that ties in with the "switched positive" fuse but I was hoping to find the HVAC port. Also, when I was pulling fuses one by one (with ignition on) to identify ports my instrument cluster started acting funny. When I turn the key it says "acc" for a few seconds and turns off. None of the normal lights. As far as I can tell none of the fuses in the interior panel are blown. Any help is greatly appreciated!

 

[speed_demon]

When I sit down the instrument cluster lights up as usual, when I put on my seat belt the seat belt light turns off, when I turn the key on all the lights turn off and the display says "ACC" for a brief period and then it goes completely dead. It will turn over but won't start.

 

[Mike10]

When I sit down the instrument cluster lights up as usual, when I put on my seat belt the seat belt light turns off, when I turn the key on all the lights turn off and the display says "ACC" for a brief period and then it goes completely dead. It will turn over but won't start.

Be sure your auxillary control handle is in neutral. This is the handle at the top of your right steering control lever. If the aux handle is engaged the engine will crank but not start.

 

[speed_demon]

Be sure your auxillary control handle is in neutral. This is the handle at the top of your right steering control lever. If the aux handle is engaged the engine will crank but not start.

The auxiliary control is locked in neutral. I also unhooked the battery for about 10 minutes without luck. I rechecked and all the fuses in the interior panel and I reseated all the relays. So far no luck.

 

[Mike10]

The auxiliary control is locked in neutral. I also unhooked the battery for about 10 minutes without luck. I rechecked and all the fuses in the interior panel and I reseated all the relays. So far no luck.

Here is what the service manual says about ACC.

12. Accessory:​

If the AIC is turned off and the ignition key is inadvertently switched to ACCESSORY, the instrument cluster will display
the backlit message "ACC" for several seconds in the text window. Subsequently, the backlight will turn off, but the​

"ACC" message will remain indefinitely

Did you disconnect or connect anything into the electrical system.

 

[speed_demon]

Here is what the service manual says about ACC.

12. Accessory:

If the AIC is turned off and the ignition key is inadvertently switched to ACCESSORY, the instrument cluster will display
the backlit message "ACC" for several seconds in the text window. Subsequently, the backlight will turn off, but the
"ACC" message will remain indefinitely

Did you disconnect or connect anything into the electrical system.

Yup I was pulling, poking, and prodding everything in sight. I just figured it out. Next to the fuse panel there are a few different two pin connectors with plugs on the end. I thought they were accessory ports so I pulled the plugs and began checking for voltage until I found one tied into the the "switched positive". I checked one of the plugs and didn't get continuity so I figured they were just to protect the port. Turns out they have a minute amount of resistance. I reinstalled and all is well! Now I'm back to trying to find a suitable power port for my heater, preferably from the HVAC circuit.

 

[Mike10]

Yup I was pulling, poking, and prodding everything in sight. I just figured it out. Next to the fuse panel there are a few different two pin connectors with plugs on the end. I thought they were accessory ports so I pulled the plugs and began checking for voltage until I found one tied into the the "switched positive". I checked one of the plugs and didn't get continuity so I figured they were just to protect the port. Turns out they have a minute amount of resistance. I reinstalled and all is well! Now I'm back to trying to find a suitable power port for my heater, preferably from the HVAC circuit.

You must have found the diodes

 

[speed_demon]

You must have found the diodes

Sounds like it. I'm such a newb! Any ideas about where to tie into the hvac circuit? There must be an unused harness somewhere.

 

[Mike10]

Yup I was pulling, poking, and prodding everything in sight. I just figured it out. Next to the fuse panel there are a few different two pin connectors with plugs on the end. I thought they were accessory ports so I pulled the plugs and began checking for voltage until I found one tied into the the "switched positive". I checked one of the plugs and didn't get continuity so I figured they were just to protect the port. Turns out they have a minute amount of resistance. I reinstalled and all is well! Now I'm back to trying to find a suitable power port for my heater, preferably from the HVAC circuit.

Is your instrument panel across the top of the cab or down the left pillar?

 

[speed_demon]

Is your instrument panel across the top of the cab or down the left pillar?

The cluster is on the left pillar.

 

[Mike10]

The cluster is on the left pillar.

There is no easy way to get the power you are looking for. The HVAC connector should be in the upper right rear corner of the cab. You may need to remove the light bar to access it. However you still need power to energize the HVAC relay. The HVAC swich harness should be at the bottom of the instrument panel opening behind the plastic pillar cover.

 

[speed_demon]

There is no easy way to get the power you are looking for. The HVAC connector should be in the upper right rear corner of the cab. You may need to remove the light bar to access it. However you still need power to energize the HVAC relay. The HVAC swich harness should be at the bottom of the instrument panel opening behind the plastic pillar cover.

You really know your stuff. So maybe I should give up on that idea and just keep it simple. What if I tied in at the ignition switch and with a 15amp inline fuse?

 

[Mike10]

You really know your stuff. So maybe I should give up on that idea and just keep it simple. What if I tied in at the ignition switch and with a 15amp inline fuse?

They do not recomment tying into the ign switch since power from the switch also powers the instrument panel and you could cause other issues. If you must have a setup where the ign switch controls the power to the heater, I would get power from the engine relay and control it by another relay that is energized by the cigarrette/aux power plug on the right pillar. I do not have time right now how to show you how to wire it but if you need help just reply so.

 

[speed_demon]

They do not recomment tying into the ign switch since power from the switch also powers the instrument panel and you could cause other issues. If you must have a setup where the ign switch controls the power to the heater, I would get power from the engine relay and control it by another relay that is energized by the cigarrette/aux power plug on the right pillar. I do not have time right now how to show you how to wire it but if you need help just reply so.

I really don't want to tear this thing apart or have a complicated mess of wires. For now so it works I'm going to run it straight from the battery with a fuse. When I get a chance I'll add a small relay triggered by the ignition switch. A 10amp relay shouldn't draw more than a 1/4 amp. Thanks for the all the help!

 

[speed_demon]

I really don't want to tear this thing apart or have a complicated mess of wires. For now so it works I'm going to run it straight from the battery with a fuse. When I get a chance I'll add a small relay triggered by the ignition switch. A 10amp relay shouldn't draw more than a 1/4 amp. Thanks for the all the help!

Thanks again Mike10. I was able to button it up yesterday and it ended up being a really clean install. I could have made it work myself but you saved me time and possibly stupid mistakes. This should make snow removal a bit more comfortable this winter.