Neutral light staying on when ignition is off

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Neutral light staying on when ignition is off

December 26, 2022, 02:03:14 pm

Hi everyone hope you all had a great Christmas! New development with the coach transmission the neutral light stays on with the ignition switch off. I have seen it go on and off with the ignotion off and hear a click each time seems to be coming from inside the dash thoughts?

Re: Neutral light staying on when ignition is off

Reply #1 – December 26, 2022, 02:18:17 pm

Anything else that should only work with ignition on work with it off-- dash HVAC fan for example?

Re: Neutral light staying on when ignition is off

Reply #2 – December 26, 2022, 02:26:47 pm

Nothing else has power just the trans panel. You can switch it to D and R as well and those respective lights light up.

Re: Neutral light staying on when ignition is off

Reply #3 – December 26, 2022, 03:47:10 pm

Quote from: leejrfla – December 26, 2022, 02:03:14 pm

Hi everyone hope you all had a great Christmas! New development with the coach transmission the neutral light stays on with the ignition switch off. I have seen it go on and off with the ignotion off and hear a click each time seems to be coming from inside the dash thoughts?

Ours did the same thing. Trans relay was sticking under dash top. See my post with photo a couple months ago. I'm at a party with only cell or I would post more.

Pierce

Re: Neutral light staying on when ignition is off

Reply #4 – December 26, 2022, 04:49:02 pm

Just tried to find the post but not real proficient with this site ang how the search function works.

Re: Neutral light staying on when ignition is off

Reply #5 – December 26, 2022, 05:46:58 pm

Will get back when we get home or in the morning.

Pierce

Re: Neutral light staying on when ignition is off

Reply #6 – December 26, 2022, 08:44:34 pm

Quote from: leejrfla – December 26, 2022, 02:03:14 pm

Hi everyone hope you all had a great Christmas! New development with the coach transmission the neutral light stays on with the ignition switch off. I have seen it go on and off with the ignotion off and hear a click each time seems to be coming from inside the dash thoughts?

Woodie, Foretravel uses a Cole Hersee relay to switch the power that would normally go through the ignition switch. Put another way, turning the the ignition switch to ON activates a relay mounted under the lift-up dash that looks similar to a starter relay. That relay could have a short in the signal line.

Re: Neutral light staying on when ignition is off

Reply #7 – December 26, 2022, 09:50:56 pm

But, if the dash HVAC fan does not run, it is NOT the ignition solenoid.

Re: Neutral light staying on when ignition is off

Reply #8 – December 27, 2022, 11:23:55 am

The big silver ignition relay, when activated, does power up many of the fuses and relays but not all as some are always hot. In my case, the neutral light would not go out and I noticed a difference between my house and engine battery voltages. When you open the dash top (on our 1993 U300 (other coaches may be different) you will see a bank of fuses against the wooden bulkhead and a drawing above showing what they power and the fuse rating. To the right is a row of small black relays, They all look the same and also have a printed legend above. I could get the light to go out by pulling the fuse toward the left side but when I put it back in, the neutral light came on again. I looked at the relay schematic and pulled the transmission relay. It's almost at the end of the row of relays. I then tapped it, replaced it and all is good again. One of our relays is not used so may be substituted for one that does not work. These are garden variety relays and not hard to find.

I can't find the old post and it's raining cats and dogs so will have to wait a day to post photos of the fuse and relay.

2 inches last night and 10 more forecast in the next week.

Hello full reservoirs, goodbye drought.

Pierce

Re: Neutral light staying on when ignition is off

Reply #9 – December 27, 2022, 11:39:36 am

Our '89 GV would occasionally leave a dash light on after I shut everything off, so I would "exercise" the shift selector lever several times and then the light would go out and stay off. What the HAY!!! What is this world coming to when something is only 33 years old and malfunctions once in awhile???!!!

Re: Neutral light staying on when ignition is off

Reply #10 – December 27, 2022, 12:31:03 pm

Quote from: Pierce & Gaylie Stewart – December 27, 2022, 11:23:55 am

When you open the dash top (on our 1993 U300 (other coaches may be different) you will see a bank of fuses against the wooden bulkhead and a drawing above showing what they power and the fuse rating. To the right is a row of small black relays, They all look the same and also have a printed legend above. I could get the light to go out by pulling the fuse toward the left side but when I put it back in, the neutral light came on again. I looked at the relay schematic and pulled the transmission relay. It's almost at the end of the row of relays. I then tapped it, replaced it and all is good again. One of our relays is not used so may be substituted for one that does not work.

The transmission relays you speak of must be unique to the U300 (6V92 with ATEC). I don't have them on our coach.

I found wiring diagram A-3376 (second link below) in Forum library "Schematics" folder. I think it shows the relay you say may be sticking? Relay #4 and #6 are powered all the time - even with ignition switch off.

https://www.foreforums.com/index.php?action=media;sa=album;in=194

https://www.foreforums.com/index.php?action=media;sa=item;in=3278#viewitem

Re: Neutral light staying on when ignition is off

Reply #11 – December 27, 2022, 05:12:08 pm

Thank you everyone I will post by detective work.

Re: Neutral light staying on when ignition is off

Reply #12 – December 27, 2022, 05:38:09 pm

Quote from: leejrfla – December 26, 2022, 04:49:02 pm

Just tried to find the post but not real proficient with this site ang how the search function works.

I can't find Pierce's old post, either, just ones that mention a stuck trans relay as a battery drain but no photos. I'm usually pretty good at finding old posts.

Re: Neutral light staying on when ignition is off

Reply #13 – December 27, 2022, 07:02:17 pm

1. I removed the 5 amp aux trans control fuse N light went out.
2. Put it back in and then unplugged relay #1 Transmission N light stayed on reinstalled relay and it clicked when I plugged it back in.

Pierce seems to be the same result so far that you experienced? Relays are cheap could you provide me with the part number you ordered the # on the OEM bosch relay 0332204150 seems to be only available used new number that seems compatable ends in 9150 from what I found.

Re: Neutral light staying on when ignition is off

Reply #14 – December 27, 2022, 09:07:54 pm

Should be able to take the relay into a GOOD auto parts store (usually NAPA) and have them match it up.

There is nothing "RV" about the relays.

Re: Neutral light staying on when ignition is off

Reply #15 – December 27, 2022, 09:24:55 pm

This is an old Bosch relay so check for later relays that will do the job. Thinking a 0332209150 will do the job and cheap too starting at $3.99. Call parts store to X-ref the relay. Easy to compare schematics for the relays.

Pierce

Re: Neutral light staying on when ignition is off

Reply #16 – December 27, 2022, 11:03:33 pm

Our DSL is back on for a few minutes. Here is a site with cross references. As you can see, there are a lot of relays that will fill the bill.

https://www.autohausaz.com/pn/0332209150

Pierce

Re: Neutral light staying on when ignition is off

Reply #17 – December 28, 2022, 07:48:32 am

Thanks I will let you know if it solves the issue.

Re: Neutral light staying on when ignition is off

Reply #18 – December 29, 2022, 05:03:25 pm

Might be the engine oil pressure switch that tells the tranny the engine is running.
1991 Grand Villa Check Trans Light is on

Re: Neutral light staying on when ignition is off

Reply #19 – December 29, 2022, 05:31:01 pm

Quote from: JohnFitz – December 29, 2022, 05:03:25 pm

Might be the engine oil pressure switch that tells the tranny the engine is running.
1991 Grand Villa Check Trans Light is on

If his problem is like our, the neutral light stays on with the key off and out of the ignition. Nothing would shut if off until I pulled the fuse and then found the little relay that was stuck on. The engine/trans would start and drive but the light stayed on 24/7 until I noticed the slightly lower voltage on the engine battery bank.

Pierce

Re: Neutral light staying on when ignition is off

Reply #20 – December 30, 2022, 06:00:07 pm

Update:
1. I installed the new transmission relay under the dash and the N light did not go out.
2. I then tried replacing the N safety relay and light still on.
3. Moving along I then unplugged the computer power thru engine relay and the N light went out installed a new relay then the N light came back on.
4. Also I checked to see if the engine hour meter was operating with the key off and it wasn't then verified it was operational with the ignition on in case it was the oil pressure sending unit as was posted by John Fitz.

Thoughts on the next step?

Re: Neutral light staying on when ignition is off

Reply #21 – December 31, 2022, 08:21:43 am

Is there power all the time to the transmission selector?

Re: Neutral light staying on when ignition is off

Reply #22 – December 31, 2022, 11:12:51 am

So I exercised the transmisson shifter several times F N R etc. Now the light is off and is staying off.....

Re: Neutral light staying on when ignition is off

Reply #23 – December 31, 2022, 11:16:37 am

1997 model has a 30-amp circuit breaker in the bay wall 12v panel that feeds start battery (always hot) voltage to a 10-amp circuit breaker on front door 12v panel, which then feeds the Allison computer.

The computer then sends this voltage to a "Neutral-Safety" Bosch-type relay coil on front door 12v panel when the transmission is in neutral.

The above is used to pass ignition switch start position voltage through "Neutral-Safety" relay to Aux Start solenoid on isolator panel. See attached Starter Wiring Circuit for details.

Re: Neutral light staying on when ignition is off

Reply #24 – December 31, 2022, 12:24:48 pm

But, totally different transmissions between the 1993 U300 and any with the Allison 3000 or 4000 series,.

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