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Post by casper171072 on Aug 9, 2018 14:30:29 GMT
The horn on my 1.5 does not work. I have fitted an aftermarket steering wheel which still has a centre horn push but it doesn't work. There are two connections on the horn centre, one in the middle and one slightly off centre marked earth, there is a metal contact on the side which connects with the steering wheel boss.
There is a wire that comes up through the centre of the steering column but I cant trace where this is from, not sure if this should be live or not. I also see there is a wire connected to the outside of the steering column via a copper ring around the steering column, not sure if this should be live or earth.
Any help would be appreciated.
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Post by canuck on Aug 9, 2018 15:33:06 GMT
The horn on my 1.5 does not work. I have fitted an aftermarket steering wheel which still has a centre horn push but it doesn't work. There are two connections on the horn centre, one in the middle and one slightly off centre marked earth, there is a metal contact on the side which connects with the steering wheel boss. There is a wire that comes up through the centre of the steering column but I cant trace where this is from, not sure if this should be live or not. I also see there is a wire connected to the outside of the steering column via a copper ring around the steering column, not sure if this should be live or earth. Any help would be appreciated. Hello Richard, I cannot help much with your aftermarket steering wheel horn push. I will try to explain how the OE horn push works and this may provide inspiration. I will assume you still have the original Cleartone High/Low note horns installed. These are fed 12v by a Brown/Green wire at each horn. These are activated by simply completing the circuit to earth at the push button on the steering wheel. The wire in the centre of the steering column is the earth wire, and should be Black.  So the assembly function is simple and quite clever.  The boss is held to the steering wheel by a screw, (post on backside of boss). This screw provides the earth through the steering wheel to the brass slip ring on the column, and provides a rotational contact for the horn push.  In the horn push at centre of the steering wheel there is a 'top hat' shape cup, (RH below)  that 'floats' on the end of the earth terminal. So; when one pushes the horn button, a contact between the centre earth wire, (top hat thingy) and the brass ring inside the center boss is established completing the circuit, and the horn sounds. Bruce |
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Post by canuck on Aug 9, 2018 15:52:32 GMT
There is a wire that comes up through the centre of the steering column but I cant trace where this is from, not sure if this should be live or not. I also see there is a wire connected to the outside of the steering column via a copper ring around the steering column, not sure if this should be live or earth. See my previous post for the picture detail of this center wire in the column. Note the insulator between it and the column. Curiosity only, if you remove the bakelite cowl you will find this connection. A mini harness runs up the outside side of the steering column, contained in a metal sleeve. I repeat this centre wire serves as the earth function for the horns. You should test the circuit for integrity before putzing about too much with a new horn push. To do this simply earth this centre wire terminal with a screwdriver or the like to the steering column. This will complete the circuit and the horns should sound. If not you will need to search out the gremlin. Bruce |
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tjt77
Junior Member
Posts: 68
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Post by tjt77 on Aug 12, 2018 19:57:01 GMT
looks like Bruce covered most of it... be aware that the Riley 1.5 steering column and all its components (with exception of center 'Riley' badge) are the same as those used on the far more common Morris minor 1000.. form '59 though till end of production.. although the morris has a different (2 spoke) starring wheel for the '65 model onwards.. everything to rebuild the steering column and its switchgear, remains available from morris minor specialists ..
Horns:- the switch effectively grounds the wire form horn, completing the circuit.. power feed comes from the live brown feed wire on fuse block, and goes into one terminal on each horn ( commonly a purple wire) and the 'grounding' terminal heads back from whence it came into the wiring loom, and re-appears inside the car, to connect to steering column.. wires on the ground or 'earth' side of the wiring generally have a black strip in them.. ground or earth wires in lucas systems are black.. most electrical problems in 'our' cars relate to bad grounding.. easy to test the horn(s) on the bench.. there is some adjustsment too.. servicing them is simple and is basically down to cleaning the points . first 'in situ' test is to check for power to horn.. if good..then connect the 'other' terminal to earth and see if it parps.. if it does the issue is likely on the grounding side of the circuit.. which is steering column end..
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