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Husqvana CTH 172 Ride on lawnmower

119 Views 2 Replies 2 Participants Last post by  swalshire
Hi all, new to this site but I hope you can shed some light on an electrical issue I have. I have a ride-on mower that I have restored from being in a tired state. When I bought it, the guy before me had sealed shut the bagger sensor & the deck engage sensor. I thought nothing of it at the time but I can see why he did it now.

My issue is, after starting the mower, the moment I go to engage the deck, it cuts out electrically, once the sensor button is left to release. I have looked at the push button sensor in question & it is getting 12 volts across from starter to key as it should from looking at below. But when button is left open by moving handle away the circuit is broken.

I checked the sensor & its working correctly. Normall Closed on when button pushed in, Normally Open when button out. What I see is that I am getting 12v across the Norm Open pins when engine running with button in but once I release it cuts out.

I found out I can overide this by pulling out the 12v wires & then the sensor works correctly & deck will engage with button out. However I believe this is not correct, I have discovered that the seat sensor does not need to be in circuit for mower to start, nor does the bag interlock work.

Apologies for the detail but I am stumped on this. Also I have 3 relays on the mower but only see 1 on the schematic ?
Font Rectangle Schematic Parallel Engineering

Would appreciate any help or if there was a more detailed schematic available.

Thanks, Sean
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are you using the word "sealed" as in relay logic noting that once the circuit is actuated it will maintain itself closed?
I kind of follow some of what you are saying. Could it be the extra relays were an attempt to modify the circuit to defeat or enhance the safety circuit?
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