Goes forward when in reverse???


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Grammabud
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Goes forward when in reverse???

Post by Grammabud » Sun Sep 23, 2018 12:38 pm



Built from a basket case. Starts, shifts stops as it should. Everything seems to be working properly. When reverse is engaged the bike goes forward.
What did I do wrong?



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ct1500
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Re: Goes forward when in reverse???

Post by ct1500 » Sun Sep 23, 2018 6:13 pm

This is with the engine running?
Local and need repair help with your 1500, Valkyrie or ST please click contact
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This is what I do

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Bluewaterhooker0
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Re: Goes forward when in reverse???

Post by Bluewaterhooker0 » Sun Sep 23, 2018 7:35 pm

Some how the polarity to the starter motor is reversed only when in reverse mode ? That's all I can think of. I'd look at the reverse related circuitry for a reversal of battery powered polarity to the starter, causing the motor to run backward only in reverse.

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AZgl1800
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Re: Goes forward when in reverse???

Post by AZgl1800 » Sun Sep 23, 2018 8:32 pm

Bluewaterhooker0 wrote:
Sun Sep 23, 2018 7:35 pm
Some how the polarity to the starter motor is reversed only when in reverse mode ? That's all I can think of. I'd look at the reverse related circuitry for a reversal of battery powered polarity to the starter, causing the motor to run backward only in reverse.
that is just about impossible.
the frame is ground.
~John

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Erdeniz Umman
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Re: Goes forward when in reverse???

Post by Erdeniz Umman » Sun Sep 23, 2018 11:32 pm

Grammabud wrote:
Sun Sep 23, 2018 12:38 pm
Built from a basket case. Starts, shifts stops as it should. Everything seems to be working properly. When reverse is engaged the bike goes forward.
What did I do wrong?
Have you used the correct manual and correct parts for your bike?
88 and 89 models have a different starter motor and reverse/start system, so the circuit diagram is different from the later models.

If you have used the parts of a later model there might be a reverse polarity issue. Because the reverse module of 88-89 models use negative (-) power to control the starter motor while the later models use positive (+).

So I recommend you not use the reverse until finding the culprit, because if there is a reverse polarity issue, the current might be flowing through the other circuits on the bike during use of the reverse.
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WingAdmin
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Re: Goes forward when in reverse???

Post by WingAdmin » Mon Sep 24, 2018 9:05 pm

As mentioned, it's impossible to reverse the polarity to the starter motor, as it uses the engine block that the starter is mounted into as ground.

I've NEVER heard of this problem before, but it has to be mechanical, not electrical.

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Erdeniz Umman
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Re: Goes forward when in reverse???

Post by Erdeniz Umman » Mon Sep 24, 2018 9:57 pm

Wingadmin if I am not mistaken, on 88 and 89 models the starter does not use its mount as a ground. It uses the relay B or reverse system to complete the ground.
So there is a possibility of an electrical issue as well as a mechanical issue, in my opinion.

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Bluewaterhooker0
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Re: Goes forward when in reverse???

Post by Bluewaterhooker0 » Mon Sep 24, 2018 11:18 pm

Erdeniz Umman wrote:
Mon Sep 24, 2018 9:57 pm
Wingadmin if I am not mistaken, on 88 and 89 models the starter does not use its mount as a ground. It uses the relay B or reverse system to complete the ground.
So there is a possibility of an electrical issue as well as a mechanical issue, in my opinion.
I've not worked on one, but I got the impression from schematics that the 88-89 models utilized terminals on the starter for both + and - connections. That's why I suggested the possibility of some reversed polarity condition, but only in reverse since the engine is starting.

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WingAdmin
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Re: Goes forward when in reverse???

Post by WingAdmin » Tue Sep 25, 2018 8:12 am

Bluewaterhooker0 wrote:
Mon Sep 24, 2018 11:18 pm
Erdeniz Umman wrote:
Mon Sep 24, 2018 9:57 pm
Wingadmin if I am not mistaken, on 88 and 89 models the starter does not use its mount as a ground. It uses the relay B or reverse system to complete the ground.
So there is a possibility of an electrical issue as well as a mechanical issue, in my opinion.
I've not worked on one, but I got the impression from schematics that the 88-89 models utilized terminals on the starter for both + and - connections. That's why I suggested the possibility of some reversed polarity condition, but only in reverse since the engine is starting.
Yup, what do you know, you're right:

88-89 starter
88-89 starter


90-later starter
90-later starter

That said...in neither case can the polarity be switched to the starter. It's only one set of relays that energize the starter, and whether it's in reverse or not cannot alter the polarity being connected to the starter. So it has to be mechanical, not electrical.

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Erdeniz Umman
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Re: Goes forward when in reverse???

Post by Erdeniz Umman » Tue Sep 25, 2018 9:18 am

One electrical possibility that I can imagine is, if a later year reverse system has been used on a 88-89 model bike, while in reverse mode, positive voltage will be provided to the negative terminal of the starter motor and since the relay B is off at this moment there will not be a short between its contacts. Then the voltage will flow through the starter, relay A contacts, and complete the circuit through the other components. This possibility may reverse the polarity in reverse mode, while a normal start can be succeeded.
Since we could not get any answer from the OP and have little information about his bike, what has been done etc. this is just a brain storming.

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virgilmobile
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Re: Goes forward when in reverse???

Post by virgilmobile » Tue Sep 25, 2018 9:28 am

With great interest..I've been reading this.
I have a 88 and the starter is 2 wire...
The first point of interest is in the first post..
It starts and runs fine...
The fact that it starts eliminates reversed starter motor direction...
"Reverse lever up and it moves forward"
Hmmmm.Lemme think a moment...
All the electric must be ok..When in reverse the second solenoid is bypassed by the resistor bank to slow the motor speed...Polarity stays the same.
I do remember that the starter motor has a speed reduction on it with 2 coupling points on the end...Was the starter removed from the engine????
There is also the 2 cables that operate the reverse mechanism on the right side back by the starter...Are those cables hooked up correctly and operating as described in the manual?



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