AC 6080 starter issues
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=159243
Printed Date: 25 Aug 2025 at 3:35am
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Topic: AC 6080 starter issues
Posted By: DougG
Subject: AC 6080 starter issues
Date Posted: 21 Mar 2019 at 6:28pm
| Neighbor has a 6080 that the starter engages , spins then kicks out and just spins the Bendix , he put a new selinoid on it same thing, I put a newly rebuilt starter on it, same thing ,, could it be the switch dropping draw or amps ? |
Replies:
Posted By: MACK
Date Posted: 21 Mar 2019 at 8:55pm
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All 6000 series needs a relay at the starter. Too much voltage drop through all the safety switches. MACK |
Posted By: DougG
Date Posted: 22 Mar 2019 at 4:17am
| Thanks Mack what kind of relay would you recommend? |
Posted By: MACK
Date Posted: 22 Mar 2019 at 7:25am
| I have always used the old Delco like the early D17 use for starter. The one with three terminals, not the four. MACK |
Posted By: DougG
Date Posted: 22 Mar 2019 at 8:08am
| Any part numbers ? Been looking on Agco partrs and cant find it, |
Posted By: DougG
Date Posted: 24 Mar 2019 at 9:44am
| Bump to top, anyone ever do this on a 6000 series? With the relay |
Posted By: Amos
Date Posted: 24 Mar 2019 at 1:52pm
| Did mine 30 years ago when the voltage was dropping and causing the occasional no starter engaging issue. Same relay on there and over 10,000 hrs later no issues other than the electrical tape (didn't think it was going to solve the issue at the time, temporary repair) that originally held the relay in place has rotted off and been replaced with a pull tie... |
Posted By: Jim.ME
Date Posted: 24 Mar 2019 at 2:46pm
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Here is a Standard Motor Products 12 solenoid relay used on some GMs. 300 amp, non- continuous rating. HTH 
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Posted By: DougG
Date Posted: 24 Mar 2019 at 2:57pm
| Thank you Jim ! Just what I was looking for! |
Posted By: Amos
Date Posted: 24 Mar 2019 at 7:59pm
| Oh man did i use something different...I will post a picture tomorrow of mine. |
Posted By: DougG
Date Posted: 24 Mar 2019 at 8:18pm
| Thanks Amos ill be looking forward to seeing the pics |
Posted By: Jim.ME
Date Posted: 25 Mar 2019 at 6:56am
Amos did you use one of the 4 pin, 30 amp relays like many vehicles use now? I have seen those, lawn tractor solenoids, and Ford type solenoids used as well as the one I posted. Any will work, the main thing is to add something that will reduce voltage drop and pass more current to the starter solenoid than the ignition switch and safety switches handle well over time.
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Posted By: IBWD MIke
Date Posted: 25 Mar 2019 at 7:20am
Just did Dad's 6080 last fall. Used a Ford style solenoid. 100% fix. I will take a pic and try to get it posted in the near future, Mike.
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DougG wrote:Posted By: Amos
Date Posted: 25 Mar 2019 at 10:18am
| Jim that is exactly what I used, took it out of a dodge K car that had been in an accident in a wreckers yard just to see if it would resolve the starting issue |
Posted By: DougG
Date Posted: 25 Mar 2019 at 6:27pm
| Thanks for the info guys,, any pics of the wiring done to make this work or explain which color goes where on this Dorman relay, thanks again |
Posted By: Jim.ME
Date Posted: 25 Mar 2019 at 6:55pm
| The terminals on those are numbered and most have a diagram made right on the plastic shell. You can do a search for that Dorman number and find a number of images on line. Several manufacturers make these and they plug into boards in vehicles, so the terminals are standard. I would post one for you, but can't on this device. Likely an operator issue, not the device. |
Posted By: DougG
Date Posted: 25 Mar 2019 at 7:36pm
| Gottcha Jim, thanks for the info, ill figure it out! |
Posted By: MACK
Date Posted: 25 Mar 2019 at 9:26pm
| 30 amp is not big enough. Will work but will not last. MACK |
Posted By: IBWD MIke
Date Posted: 26 Mar 2019 at 2:03pm
Here's a couple of pics of my install. Was kind of hard to get a good shot around the loader bracket.  |
Posted By: Steve in NJ
Date Posted: 26 Mar 2019 at 6:15pm
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You would want to use a regular high amp solenoid like the one in Jim's pic. Standard Motor Products or Cole Hersee are top quality pieces. I carry both in stock and use them on my 12V conversion Starter motors. A Ford style would work fine also. That code 1 relay is way to light for that type of application. Won't take the continuous duty needed to crank over the engine. Our 1501-08E solenoid would fit the bill there. Even has an override button on top to the solenoid for bumping the engine over... Steve@B&B ------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife |
Posted By: DougG
Date Posted: 29 Mar 2019 at 6:34pm
| Thanks guys for all the info ! |
Posted By: Michael (WI)
Date Posted: 01 Apr 2019 at 12:34pm
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Currently my 6080 has occasional no starts, but in my case there is zero starter spin. I wired a test bulb on the starter solenoid and found no light at all when twisting the key. So, I figure one of my safety switches is making intermittent contact because when it does crank the test bulb lights right up. At first I did suspect a low voltage issue because hooking up the battery charger to the batteries would make it spin, but the light told me it was getting zero volts with out the charger. Apparently the boosted voltage from the charger is forcing the faulty connection in the safety switch to make contact. That being said I know I did have a low voltage issue before I put new batteries and cables in. If it should come back again I would like to know more abut this added solenoid. I am having a tough time trying to draw a mental wiring diagram to see how this is being added on top of the existing starter solenoid. It's also been two years since I looked at the manual's wiring chart so I forget how power is currently routed from the key, through all the safety switches to the solenoid on board the starter. Is the additional solenoid completely by-passing all the safety switches and going straight from the key to the new solenoid?
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Posted By: exSW
Date Posted: 01 Apr 2019 at 12:44pm
| You're overthinking it. Do a little research on how a relay works. The relay transfers main starting power from the battery through itself to the draw(starter).This is why you have to use a heavy duty relay. It carrys all the current. The wire that excites the starter at the starter itself will be the wire that trips the relay. Find a 70's Ford or Dodge pickup that has the relay/solenoid mounted on the inner fender near the battery. Look at how it's configured. |
Posted By: Jim.ME
Date Posted: 01 Apr 2019 at 3:58pm
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Michael (WI), Here is a simple sketch for you to look at. All the existing starting circuit wiring remains, with all the safeties. You need to be sure those are all working properly, adding a relay solenoid won't repair a bad component. 
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