1996 Johnson 70-HP: Power Tilt-Trim Won't Go UP

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  1996 Johnson 70-HP: Power Tilt-Trim Won't Go UP

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Author Topic:   1996 Johnson 70-HP: Power Tilt-Trim Won't Go UP

gmoulder posted 08-24-2014 05:28 PM ET (US)
Help, again. Seems as the Whaler is falling apart. Soon as I get the steering fixed, the starboard engine will not trip "up" on the 1988 Outrage 18 with 1996 Johnson 70-HP engines. The starboard engine has decided to get in line with everything else going to pieces. Engine trims down with both remote and engine mounted switches, does not trim up with either. Deduction would point to a reduced number of possibilities. What are the usual suspects? Thanks, Glen
Qtrmeg posted 08-24-2014 06:05 PM ET (US)
I would suspect the trim up wire at the engine, probably a blue wire with white stripe.
sosmerc posted 08-25-2014 12:17 AM ET (US)
most likely you have one bad relay. If the engine won't go up, it's usually the "down" relay that is bad....the relay that is connected to the green wire from the trim motor.
seahorse posted 08-25-2014 07:49 AM ET (US)
Check the wires from the trim limit switch and you can bypass them for testing. When you push the UP button, current has to flow from the button through the trim limit switch, then to the UP relay to activate the trim motor.
jimh posted 08-26-2014 07:07 AM ET (US)
The TRIM function is an electro-hydraulic system. Determine if the malfunction is in the electric or the hydraulic portion. This is easily done by listening for the operation of the electrical pump motor that creates the hydraulic pressure. If that motor is not running, the problem is usually electrical.
If the problem is electrical, the electrical control system is very simple, and the problem can be diagnosed with simple DC electrical analysis.
If the problem is hydraulic, obtain the service manual for your outboard engine, and located the diagnosis and repair procedure for the hydraulic system. The hydraulic system generally contains an actuator ram and several valves.
The limit switch in the UP circuit as noted be Seahorse will be a very good place to look first, as it seems to be a unique feature of the UP circuit.
crabby posted 08-26-2014 07:36 AM ET (US)
Swap the relays and see if the problem follows the relays. If it does, replace the bad relay.
gmoulder posted 08-26-2014 04:13 PM ET (US)
This [advice] is good stuff. Where are the relays? I now have a factory manual for the engines, but please give me a head start in locating them? And as soon as I finish re-building the carburetorss on the Port engine I will deal with trim business. Thanks, Glen.
knothead posted 08-26-2014 04:51 PM ET (US)
I've a 90 hp Johnson so things won't be exactly the same, but maybe this will help: the trim switch on the port side of your motor's lower cowling should have wires going to the relays. On my motor the relays are small square boxes that look like relays. They are positioned on top of the port carb on my motor which is a V4. Now I know you have an in-line three-cylinder motor; look around on the port side of your motor. Again, the relays should be wired to the trim switch on your lower cowling's port side.
Disclaimer: This is just a guess.
regards---knothead
jimh posted 08-26-2014 11:14 PM ET (US)
Use SHOP.EVINRUDE.COM to look up the engine. You can usually find exploded view diagrams showing most components and their locations.
crabby posted 08-28-2014 08:00 AM ET (US)
I'm not certain about a mid-1990's three cylinder but on my older three cylinder engines the trim relays were in a plastic box that sat on top of the air silencer. Two screws hold the cover on; the relays were plugged into sockets.

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Author	Topic: 1996 Johnson 70-HP: Power Tilt-Trim Won't Go UP
gmoulder	posted 08-24-2014 05:28 PM ET (US) Help, again. Seems as the Whaler is falling apart. Soon as I get the steering fixed, the starboard engine will not trip "up" on the 1988 Outrage 18 with 1996 Johnson 70-HP engines. The starboard engine has decided to get in line with everything else going to pieces. Engine trims down with both remote and engine mounted switches, does not trim up with either. Deduction would point to a reduced number of possibilities. What are the usual suspects? Thanks, Glen
Qtrmeg	posted 08-24-2014 06:05 PM ET (US) I would suspect the trim up wire at the engine, probably a blue wire with white stripe.
sosmerc	posted 08-25-2014 12:17 AM ET (US) most likely you have one bad relay. If the engine won't go up, it's usually the "down" relay that is bad....the relay that is connected to the green wire from the trim motor.
seahorse	posted 08-25-2014 07:49 AM ET (US) Check the wires from the trim limit switch and you can bypass them for testing. When you push the UP button, current has to flow from the button through the trim limit switch, then to the UP relay to activate the trim motor.
jimh	posted 08-26-2014 07:07 AM ET (US) The TRIM function is an electro-hydraulic system. Determine if the malfunction is in the electric or the hydraulic portion. This is easily done by listening for the operation of the electrical pump motor that creates the hydraulic pressure. If that motor is not running, the problem is usually electrical. If the problem is electrical, the electrical control system is very simple, and the problem can be diagnosed with simple DC electrical analysis. If the problem is hydraulic, obtain the service manual for your outboard engine, and located the diagnosis and repair procedure for the hydraulic system. The hydraulic system generally contains an actuator ram and several valves. The limit switch in the UP circuit as noted be Seahorse will be a very good place to look first, as it seems to be a unique feature of the UP circuit.
crabby	posted 08-26-2014 07:36 AM ET (US) Swap the relays and see if the problem follows the relays. If it does, replace the bad relay.
gmoulder	posted 08-26-2014 04:13 PM ET (US) This [advice] is good stuff. Where are the relays? I now have a factory manual for the engines, but please give me a head start in locating them? And as soon as I finish re-building the carburetorss on the Port engine I will deal with trim business. Thanks, Glen.
knothead	posted 08-26-2014 04:51 PM ET (US) I've a 90 hp Johnson so things won't be exactly the same, but maybe this will help: the trim switch on the port side of your motor's lower cowling should have wires going to the relays. On my motor the relays are small square boxes that look like relays. They are positioned on top of the port carb on my motor which is a V4. Now I know you have an in-line three-cylinder motor; look around on the port side of your motor. Again, the relays should be wired to the trim switch on your lower cowling's port side. Disclaimer: This is just a guess. regards---knothead
jimh	posted 08-26-2014 11:14 PM ET (US) Use SHOP.EVINRUDE.COM to look up the engine. You can usually find exploded view diagrams showing most components and their locations.
crabby	posted 08-28-2014 08:00 AM ET (US) I'm not certain about a mid-1990's three cylinder but on my older three cylinder engines the trim relays were in a plastic box that sat on top of the air silencer. Two screws hold the cover on; the relays were plugged into sockets.