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Author Topic:   Johnson Tilt/Trim problems
LarrySherman posted 07-22-2001 11:43 PM ET (US)   Profile for LarrySherman   Send Email to LarrySherman  
I broke it. Before I rewired the boat it worked. Glad to get that out of the way. Now, I traced the cable, appears to be 5 wires, 3 12 guage to the switch, and 2 18 guage to the indicator. All go through a seperate harness to the motor, and then into a relay(?) box mounted on the exhaust manifold. When I start it up, my new teleflex guage bottoms out. Should I just run new wire? Is there a fuse anywhere? I'm soooo close!
Hank posted 07-23-2001 12:47 AM ET (US)     Profile for Hank  Send Email to Hank     
Larry
Your post mentions the Trim guage but does not say if the tilt/trim mechanism is working.
If your only problem is the gauge, there does not appear to be a separate fuse between the sending unit and the gauge on the diagram in my OMC service manual or on my engine.. There is a fuse protecting the trim/tilt motor. This is independent of the gauge/ sending unit circuit.

The gauge receives three wires. Two from the sending unit and one from the key switch. The gauge only works with the switch on.

One (black) wire from the sending unit goes to one terminal in the relay box which is grounded.
This grounded terminal then connects (black and tan wire) to the gauge at the point G. The other (black) wire from the sending unit also goes to the relay box and is there connected to another terminal. This terminal is then connected (white and tan wire) to the gauge.
These two wires represent the varying resistance across the sending unit.
Finally a (purple) wire from the key switch is connected to the third point on the gauge.This last wire provides current to the gauge. If your gauge is bottoming you may have the wires incorrectly connected at the gauge.
Hope this helps.
Hank

Hank posted 07-23-2001 01:00 AM ET (US)     Profile for Hank  Send Email to Hank     
Larry
In rereading your message I get the impression that you only have the two wires from the sending unit connected to the gauge.
You need a third wire (purple) from the key switch to provide the voltage to the gauge.
This is not in the cable harness and is a separate connection in the console.
Hank
LarrySherman posted 07-23-2001 11:00 AM ET (US)     Profile for LarrySherman  Send Email to LarrySherman     
Hank,

Thanks for your reply. I should have been more specific. The old guage never worked, but the tilt/trim motor would work. When I rewired the boat, esp the console, in untangeling the 20 year old birds nest, perhaps I disconnected something? I have tried swapping the sending unit wires at the guage, and it maxes out, so I puth them back. I will check the purple ignition wire, and make sure it is connected.

I couldn not understand from you post if there is a fuse for the tilt motor or not. I do understand that there is not one fo the guage.

Thanks, Larry

Hank posted 07-23-2001 10:56 PM ET (US)     Profile for Hank  Send Email to Hank     
Larry
There is a fuse for the tilt motor in some versions of the engine. My Service Manual shows one wiring diagram for engines with power T/T with fuse and another for engines with power T/T but no fuse .( My engine has a fuse.) The only difference I can see in the two diagrams is the fuse in the relay box. If you had a fuse problem your Trim/Tilt Motor wouldn't work. Your gauge /sending unit circuit would be unaffected. I'm not clear, Larry, is your Tilt Trim Motor Working ?
Hank

LarrySherman posted 07-24-2001 05:59 AM ET (US)     Profile for LarrySherman  Send Email to LarrySherman     
Tilt/Trim does not work. It used to work before I rewired the boat. Is the fuse on your motor inside the relay box, or is outside the box?


thanks, Larry

Hank posted 07-24-2001 11:50 PM ET (US)     Profile for Hank  Send Email to Hank     
Larry
I frankly don't remember for sure whether the fuse is inside the box or just outside the box.My best recollection is that it is in the junction(relay)box. It is an inline fuse in a rubber housing. It should have a red wire entering and a red and purple wire leaving it. It is connected between two contact points within the box.
I'll try to take a look tomorrow.

Incidentally, have you looked in your junction box ? I found on my engine that some of the connectors in the box were corroded. Specifically the connectors to the sending unit were so bad I merely cut them off and made permanent splice connections.

I also took a look inside my console and noted that my T/T Gauge has two additional wires for lighting. Also the purple wire I mentioned was extended from my keyswitch via my overtemperature warning horn. Incidentally I also noted a mud wasp nest. At least they'll kill the spiders.

Hank

LarrySherman posted 07-25-2001 10:47 AM ET (US)     Profile for LarrySherman  Send Email to LarrySherman     
Yup Hank,

My wires corroded too. I am not sure what the relays are for. I'll have to dig through the manual I guess. I'm going up to the boat tommorow, I've got to get this think in the water SOON!

Hank posted 07-25-2001 01:23 PM ET (US)     Profile for Hank  Send Email to Hank     
Larry
I checked my engine. The junction box has "FUSE INSIDE" embossed on it.
Hank
LarrySherman posted 07-25-2001 01:29 PM ET (US)     Profile for LarrySherman  Send Email to LarrySherman     
Thanks Hank,

I'll take a look tomorrow. Hope I can figure it out!

Thanks again

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