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Old 03-08-2019, 02:46 PM   #1
kipps
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Kelsey Hayes 81740 manual pics

This manual came with a new-in-box 81740 controller. I thought I'd put it out there for reference.

Note that the latest date mentioned is 1973, which indicates when this manual was printed.
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Old 03-08-2019, 03:21 PM   #2
kipps
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Re: Kelsey Hayes 81740 manual pics

A number of the Kelsey Hayes fittings cross reference in the Edelmann catalog. Following is a page from that catalog. Try googling the Edelmann number if you don't get results with the Kelsey Hayes number. For example, search for "127031 brake"

I found the 127031 fitting available for 10-ish at O'Reilly's auto parts.
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Last edited by kipps; 03-08-2019 at 03:46 PM.
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Old 03-09-2019, 09:07 AM   #3
kipps
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Re: Kelsey Hayes 81740 manual pics

I have a Kelsey Hayes resistor on order. If there's any factory documentation with that, I'll edit this post to include it.

Edit to add: still waiting for a resistor to arrive. There appear to be two styles of resistors. One style used four studs, and three "spring" type resistors. These are jumpered in different positions to give different resistance values. The second style has two parallel resistor "springs", and a bridge between them that is loosened/tightened by a thumbscrew to allow adjustment. Just guessing here, but it looks like the break point between these styles was in the 1970's.

A caution I see mentioned on various forums. The resistor, of either type, will generate a lot of heat. Three points to make about that. #1, Don't box it up close anywhere, like under a dash or beauty cover. Leave it where there's plenty of passive airflow. #2, be careful adjusting it after use. It will be burning hot to the touch. #3, it will likely smell a bit as it burns off any oils and preservatives on first use.

Tekonsha is another manufacturer of a similar resistor. Folks on forums claim to have good luck using these resistors(i.e., not burning out). Tekonsha part# 2012 is recommended for 2 and 4 brake systems, and part# 2013 is recommended for 4 and 6 brake systems, per their factory literature. It's only my speculation that these Tekonsha resistors would work fine with a Kelsey Hayes controller.

Attached are two Kelsey-Hayes resistor pics I pulled off of Ebay(Is that legal?). The first pic is the older style, and is associated with part# 106700. The second is the newer "bridge" style, and is associated with part# 41149.
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Last edited by kipps; 03-15-2019 at 03:09 PM.
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Old 03-09-2019, 09:30 AM   #4
kipps
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Re: Kelsey Hayes 81740 manual pics

Here's a pic of what came in the Kelsey Hayes box. Note the controller, the brake line(both ends are the same), the double-sided sticky tape, the bag with mounting screws and wire nuts, the blue wire(goes to the trailer, i think), and some miscellaneous double red wire. I don't know the purpose of the red wire.

The controller has two holes through the body to allow mounting screws to pass through.
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Old 03-09-2019, 10:50 AM   #5
Bigdav160
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Re: Kelsey Hayes 81740 manual pics

That was the one I had with my first '72 Suburban
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Old 03-15-2019, 04:09 PM   #6
kipps
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Re: Kelsey Hayes 81740 manual pics

Here's a PDF link to a Kelsey-Hayes trailer brake manual. Includes some more useful info.

http://nebula.wsimg.com/d4e8df79f0c8...&alloworigin=1
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