1990 Ultra Classic Problem!!
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Road Master
Joined: Aug 2007
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1990 Ultra Classic Problem!!
I tried this in the electrical section because another forum member had the exact same problem but didn't get any responses.
I just picked up a mint 1990 FLHTCU. When I apply the front brake the radio turns off. When I release the front brake the radio comes back on. This only occurs with the front brake.
The previous owner told me about the problem before I bought the bike. He was the original owner and kept the bike beautiful. He replaced the stator and the voltage regulator thinking that it would solve the problem. It didn't. I talked to him last night and he told me he also cleaned and inspected the starter cables and grounds.
He also told me that a couple of local Harley repair shops told him that it is normal.
I just can't believe that.
Any help would be greatly appreciated.
I just picked up a mint 1990 FLHTCU. When I apply the front brake the radio turns off. When I release the front brake the radio comes back on. This only occurs with the front brake.
The previous owner told me about the problem before I bought the bike. He was the original owner and kept the bike beautiful. He replaced the stator and the voltage regulator thinking that it would solve the problem. It didn't. I talked to him last night and he told me he also cleaned and inspected the starter cables and grounds.
He also told me that a couple of local Harley repair shops told him that it is normal.
I just can't believe that.
Any help would be greatly appreciated.
Road Master
Joined: Apr 2009
Posts: 915
Likes: 2
From: nw alabama
does it cut radio off when sitting still and engine not running???sounds like a pinched wire or two..on my old sporty, i could touch the brake and the starter would enguage(pinched wires it switch housing on the bars)
Cruiser
Joined: Sep 2009
Posts: 168
Likes: 1
From: Central Mass
not normal but???
I have 1987,1989,1990 dressers,there is a solenoid on the front end that creates an anti-dive effect.This is not activated with the rear brake. This draws a lot of power and with the marginal stock charging system the battery voltage can drop below the minimums to run the radio. Does this happen only at idle or do you get this when rpms are over 2500 also? What is your voltage when this happens?
Stan
Stan
Thread Starter
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Road Master
Joined: Aug 2007
Posts: 848
Likes: 8
From:
I have 1987,1989,1990 dressers,there is a solenoid on the front end that creates an anti-dive effect.This is not activated with the rear brake. This draws a lot of power and with the marginal stock charging system the battery voltage can drop below the minimums to run the radio. Does this happen only at idle or do you get this when rpms are over 2500 also? What is your voltage when this happens?
Stan
Stan
If it is the selenoid is there any fix? Can I disconnect it to see if the problem goes away?
Since you have had so many dressers can I ask one other question? I notice static coming out of all of my speakers whether the bike is running or not or if the radio or CB are on or off.
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Road Master
Joined: Aug 2007
Posts: 848
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From:
No, I didn't. I just got the bike on Saturday. Battery is a few years old. Maybe 3 years. It has always been maintained and when I put it on my battery tender it went to green within a few minutes. The thing that perplexes me is if it was the battery why would the radio shut off only when I grab the front brake.
Thread Starter
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Road Master
Joined: Aug 2007
Posts: 848
Likes: 8
From:
I have 1987,1989,1990 dressers,there is a solenoid on the front end that creates an anti-dive effect.This is not activated with the rear brake. This draws a lot of power and with the marginal stock charging system the battery voltage can drop below the minimums to run the radio. Does this happen only at idle or do you get this when rpms are over 2500 also? What is your voltage when this happens?
Stan
Stan
I appreciate your help on this. Its a strange problem.
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Cruiser
Joined: Sep 2009
Posts: 168
Likes: 1
From: Central Mass
anti dive on front only
The anti dive solenoid works only with the front brake.I would replace the battery so that you have a good known battery.Use H.D. battery or Deka Brand for best results.Something is creating a low voltage situation and the front brake solenoid is breaking the camels back so to say.You can disconnect the solenoid but its a P.I.T.A. It is mounted near the top of the left fork tube.You may be able to see the 2 wires and can maybe dis-connect the ground wire.With the ign. switch in the on position (not running) hit the front brake and listen for a click, that would be your solenoid.It may not click because of its age it may be drawing more than normal.You may need to pull outer fairing off and set up a fan to cool engine and run in neutral. Then try to simulate problem. I believe you have a low voltage situation and not a shorted wire. Also do you have extra lights etc on this because the alternator puts out almost nothing below 2000 rpm. Check voltage at various locations for an abnormal reading. This is not an easy to diagnose issue as you already know.I get no static but will get a humming noise out of the radio on my 1987 with stock Radio ,my 1990 Ultra has had the radio replaced with a Biketronics set-up and cb etc. removed.
Stan
Stan