How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask K. Kergan Your Own Question
K. Kergan
K. Kergan, Marine Mechanic
Category: Boat
Satisfied Customers: 1031
Experience:  24 yrs exp. Inboard/Outboard mechanic Mercury/ Mercruiser, Volvo Penta and OMC, Johnson/Evin.
13730749
Type Your Boat Question Here...
K. Kergan is online now
A new question is answered every 9 seconds

1975 HOUSEBOAT, mercruiser 225 hp. 302 ford. 5.0 liter. no

Customer Question

1975 HOUSEBOAT, mercruiser 225 hp. 302 ford. 5.0 liter. no voltage at coil, with key on. key has 12.4 volts to it. if i hotwire to coil, i get spark to coil but engine no crank.
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.

Hello.

Do you have voltage at the coil when cranking?

Could I get engine serial number please?

Customer: replied 1 year ago.

i would like to use another expert. TAN gave BAD advise on my other question regarding buying a module for a 1988 boat BUT BOAT ;STILL DOES NOT WORK. I WANT TAN TO FINISH THIS JOB BEFORE I USE HIM AGAIN.

Expert:  K. Kergan replied 1 year ago.

Hi, my name is Kerry

Does your engine still have the original breaker points ignition system?

Expert:  K. Kergan replied 1 year ago.

With point ignition, there will be no voltage reading at the coil when the points are closed.

Expert:  K. Kergan replied 1 year ago.

If you disconnect the wires from the coil negative terminal, you should have battery voltage on the positive terminal of the coil with the key on.

Customer: replied 1 year ago.

did that but still no voltage at coil, positive side.

Customer: replied 1 year ago.

still no voltage at coil

Expert:  K. Kergan replied 1 year ago.

Sorry about the delay.

If there is power on the key switch and none to the coil, there is a problem somewhere between the key and the coil. This could be a bad connection at the engine harness plug.

Most of these engines have a circuit breaker mounted on the engine, make sure you have battery voltage to both sides of the circuit breaker. The circuit breaker usually has a red button with a number on it, usually 40 or 50 for the number of amps.

Expert:  K. Kergan replied 1 year ago.

Have you checked if the power gets past the ignition switch?

Maybe the switch is no good.

Expert:  K. Kergan replied 1 year ago.

Do you still have an issue?

If not, please let me know what resolved it.

Customer: replied 1 year ago.

think i have tracked problem to a flybridge on/off switch, a toggle that may be bad.

why did it take you two months to get back with me??

Expert:  K. Kergan replied 1 year ago.

I was waiting for a reply from you.

When we get a reply we are notified by email.

Quite a few people never reply or respond, so I wait for a reply notification.

Once in a while I go through my old questions, that's what happened.

Customer: replied 1 year ago.

ok

Expert:  K. Kergan replied 1 year ago.

Did you confirm that you have a bad switch?

Related Boat Questions