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Honda HT3813 bad starter relay

219 Views 10 Replies 5 Participants Last post by  Dave55
Hi, I am working on a Honda HT3813 and found that the starter relay is bad, does anyone out there know where I can buy a replacement relay? I have searched high and low and cannot find one. The relay that is bad is an Omron 38501-GF4-701. I also found an alternate relay Mitsuba 38501-GJ2-004 but cannot find this as well. Any suggestions? Does anyone know where I can find a used one?
Appreciate any help,
Thanks
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If you can't find a replacement, you might consider:
-taking it apart and cleaning the contacts inside. Depending on it's construction and how careful you are at getting it apart, it can work like new again.
-looking at the wiring diagram for the tractor, to see which connection goes where, as if it's a standard 4 post relay, you can get spade connectors and wire up a regular 4 post relay of sufficient rating. It won't look as nice, but it'll work just fine.
If you can't find a replacement, you might consider:
-taking it apart and cleaning the contacts inside. Depending on it's construction and how careful you are at getting it apart, it can work like new again.
-looking at the wiring diagram for the tractor, to see which connection goes where, as if it's a standard 4 post relay, you can get spade connectors and wire up a regular 4 post relay of sufficient rating. It won't look as nice, but it'll work just fine.
If you can't find a replacement, you might consider:
-taking it apart and cleaning the contacts inside. Depending on it's construction and how careful you are at getting it apart, it can work like new again.
-looking at the wiring diagram for the tractor, to see which connection goes where, as if it's a standard 4 post relay, you can get spade connectors and wire up a regular 4 post relay of sufficient rating. It won't look as nice, but it'll work just fine.
thanks for the info... I'll try to take apart and hope for the best
Looks like you have two options.
Fix the one you have.
Rewire a different one to work.

I did a search on that number, looks like Honda used in on outboard motors, scooters, lawn mowers and garden tractors.
And all of the say discontinued part number.
If you can't find a replacement, you might consider:
-taking it apart and cleaning the contacts inside. Depending on it's construction and how careful you are at getting it apart, it can work like new again.
-looking at the wiring diagram for the tractor, to see which connection goes where, as if it's a standard 4 post relay, you can get spade connectors and wire up a regular 4 post relay of sufficient rating. It won't look as nice, but it'll work just fine.
I agree. Likely 2 spades are for the coil activation and 2 for the switched circuit. I use the standard relay in some cases to put direct pathfrom batteryto the starter solenoid ,activating the relay with current that came from starter switch to solenoid via the safeties. Maybe that's what Honda is doing. I know some JDs won't start unless you have that extra relay
Hi, update on relay... 1st you are right, 2 spades activate the coil and 2 spades are for the switch. So as for the relay I was able to take it apart and found that there was rust, etc. Luckly I was able to clean (the best that I could) and when I applied 12V it actually work. Going to put back in and see if it will try to start. thanks for your help..
it will likely work for a short while, but you should note which wires / spade terminals are doing what. A standard automotive SPST - single pole single throw - relay should be readily wired in to perform the current function. The general idea is to get a relay along with a plug that has 'pigtails', and connect the pigtail wires to the original wiring. Be sure to use some heat shrink on the joints if/when you do the replacement to avoid corrosion over time.
tom
it will likely work for a short while, but you should note which wires / spade terminals are doing what. A standard automotive SPST - single pole single throw - relay should be readily wired in to perform the current function. The general idea is to get a relay along with a plug that has 'pigtails', and connect the pigtail wires to the original wiring. Be sure to use some heat shrink on the joints if/when you do the replacement to avoid corrosion over time.
tom
Thanks Tom, the relay did work and the tractor at least started. But you are right about it failing in the future because it was pretty corroded. I'm not really good at electrical issues and for me getting this tractor to run was pretty incredible. Hopefully I can find this relay that you mentioned and go from there. Thanks for the advice. Gary
I would question that plug in relay would carry enough current to operate the starter very long.
That relay may be energizing a standard starter solenoid somewhere down stream that actually supplies current to the starter.

Never mind I found a wiring diagram, that relay is the starter solenoid.


crappy picture, can't read the colors or trace the wires very well, but good enough to see there is no solenoid
However, from that diagram, it looks like the starter itself has a relay/solenoid as part of it, so this separate one shouldn't need to carry that much current.
At the right zoom level I think you are correct. I was in to far trying to see wire colors and that was just a blob.
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