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I am ***** ***** I have a mercruiser 470 which has been

Customer Question
Customer: hi jason. I am...
Customer: hi jason. I am ***** ***** I have a mercruiser 470 which has been rebuilt and put in my old launch. I need help wiring the tacho
JA: Thanks. Can you give me any more details about your issue?
Customer: my tacho is a wema brand inclusive of hour meter. I hve power to it but am unsure how to connect mytacho. which wire is on the merc wiring loom as the sender for the tacho
JA: OK got it. Last thing — JustAnswer charges a fee (generally around $26) to post your type of question to Boat Experts (you only pay if satisfied). There are a couple customers ahead of you. Are you willing to wait a bit?
Customer: yes
JA: OK. Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.Category: Boat
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Customer reply replied 1 year ago
the engine still runs the stator system. Is it possible as it has no alternator to bypass the loom and go onto the negative side of the coil. I have connected this and had the tacho running but am unsure what to set the tacho at to align with the coil ie rev ratio. the tacho is wema with inbuilt hour meter. It is programmable on the back of the tacho by pushing a rubber button and goes up an down in .5 increments.
please advise
aaron
Answered in 2 hours by:
12/29/2015
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,288
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

Hi Aaron, my name is ***** ***** I will be helping you today. I would need to know the exact model number or part number of the tach that you have.

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Customer reply replied 1 year ago
Hi Jason,
Tacho is a wema iqhb-bv-8kl
Hope this helps
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

unfortunatley it does not. Is that the number on the back of it? I tried punching that number into google and got no results. Are there any other numbers on the tach, or the box the tach came in? Can you take any pictures of the front and back of it?

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Customer reply replied 1 year ago
That is the model number I google it and had no issue
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

I don't see it. Can you share the link with me?

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Customer reply replied 1 year ago
HI Jason,
please see below and copy and past into your browser, i look forward to your response
http://www.wema.com/?page=417&show=480#Tacho%208000
aaron
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Hi Aaron. To be honest i'm not sure if this tachometer is going to work for you. It states in the instructions "this tachometer can only be used with an alternator with a W terminal"

That being said. Just for the heck of it. Have you tried hooking it up to the gray wire that is in the engines harness?

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Customer reply replied 1 year ago
Hi Jason I've tried the gray in the loom but there is no signal. How do I check if the gray is sending any signal
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

You would use either a standard tachometer or a lab scope (oscilliscope) to check for an output signal. Do this as a test. Start the engine up. And then when it's running take the gray wire and touch it to ground. If there is a signal the engine should stall. Let me know if it stalls or not.

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Customer reply replied 1 year ago
Jason,
I can get signal from the negative side of the coil. Would the ratio setting of 2.0 be correct to be the same as the revolutions of the engine. If not please advise the setting i should use and would this prove to be acceptable
Aaron
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Aaron.

This tachometer is not designed to work with you engine. It 'might" work, but it is not designed to. With the engine at idle, what does the tach read with it set to 2.0? What does it read when set to 4.0? It might not be 100% accurate but you might be able to use it if it is "close enough".What do you get for readings

'

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Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Hi Aaron, just checking in. Any luck/progress?

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Jason
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Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,288
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Experience: Degree in Marine Technology. Gas and diesel marine mechanic.

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