![Reply](/forums/images/maxum/buttons/reply.gif) |
07-03-2024, 09:06 PM
|
#1
|
Ensign
Join Date: Jul 2024
Location: Arlington, WA
Posts: 8
|
Popping Ignition Fuse when Key Returns to On Position
Hey All, been spending some time reading the electrical section of the forum, as well as searching topics, yet haven't come across this issue yet.
Boat: A 2000 2100SR
Motor: 5.7 Mercruiser
Problem: Ignition Fuse
Backstory: I knew the starter was weak and was going to be replaced this year yet tried to start the boat anyhow after its initial uncovering. A battery terminal started to smoke and melted the negative terminal on one battery.
I fixed the wiring damage, replaced starter, replaced both batteries, cleaned all remaining terminals and had no power; however, I learned the ignition fuse was popped. Yay, problem found. Nope.
Every time the fuse was replaced the boat would crank until the ignition was allowed back to the on position were the fuse would pop again.
Then the coil was replaced, ignition key replaced, checked main engine ground (appeared to be in good condition), checked power at the 50amp fuse, and the alternator was bypassed to see if it was causing the fuse to blow.
But same problem persisted when the key went back to the on position.
Buddy and I are at a loss where to search next for possible short/power surge. Any insight or recommendations are highly appreciated. Thanks.
__________________
__________________
Toby Barnett
- 2000, Maxum 2100 SR 5.7 MerCruiser
- 1985, 15ft Zodiac Pro 60hp 2-Stroke Mercury
|
|
|
07-03-2024, 11:56 PM
|
#2
|
Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,537
|
Welcome aboard!
Let’s try to isolate the issue between the cranking circuit and ignition circuit. Try Turing off the kill switch on the shifter which will remove power from the ignition circuit. Does the fuse still blow when cranking the engine over? If yes it’s an issue with the starting circuit if no it’s an issue with the ignition circuit.
Under Documents of this site you will find the Mercruiser manual for you engine which includes the engine wiring diagram. Let me know if you or your buddy are familiar with reading wiring diagrams and if not I can help you through the next steps.
Also is this a carburetor or fuel injection engine?
__________________
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
|
|
|
07-04-2024, 12:08 AM
|
#3
|
Ensign
Join Date: Jul 2024
Location: Arlington, WA
Posts: 8
|
Thanks for response, Captain. Yes, we're familiar with reading diagrams and will download the manual. We'll also try the recommendation of turning off the kill switch and see if there a "yes" "no" based on the recommendation.
__________________
Toby Barnett
- 2000, Maxum 2100 SR 5.7 MerCruiser
- 1985, 15ft Zodiac Pro 60hp 2-Stroke Mercury
|
|
|
07-04-2024, 12:10 AM
|
#4
|
Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,537
|
Quote:
Originally Posted by TobyB
Thanks for response, Captain. Yes, we're familiar with reading diagrams and will download the manual. We'll also try the recommendation of turning off the kill switch and see if there a "yes" "no" based on the recommendation.
|
Great! Let us know how you make out and if you have any questions.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
|
|
|
07-08-2024, 06:49 PM
|
#5
|
Ensign
Join Date: Jul 2024
Location: Arlington, WA
Posts: 8
|
Hey Captain Mike,
We went through the kill switch and it was working correctly then were able to isolate the problem to the engine side. With no real answer, the boat stopped blowing ignition fuses and would start and run for 5 - 30s before shutting off.
We continued testing was in order with the next being the oil pressure switch, oil pressure sending unit, and fuel pump which all checked out fine.
We then went back the new starter and the starter appears to have an internal short. The meter was showing short when going from the yellow/purple wire connection to the side of the starter (believe that is what my mechanic was saying as I wasn't down there).
Unless, there are other ideas. I will likely pull the starter tonight and see if anywhere can test it as the boat shop can't from what they said this morning.
__________________
Toby Barnett
- 2000, Maxum 2100 SR 5.7 MerCruiser
- 1985, 15ft Zodiac Pro 60hp 2-Stroke Mercury
|
|
|
07-08-2024, 09:02 PM
|
#6
|
Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,537
|
Hi Toby, sounds more like the short is in the starter solenoid but it should have come with the new starter. Most auto places should be able to test it. Any idea if you can return it?
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
|
|
|
07-10-2024, 07:21 PM
|
#7
|
Ensign
Join Date: Jul 2024
Location: Arlington, WA
Posts: 8
|
Quote:
Originally Posted by mmwjr
Hi Toby, sounds more like the short is in the starter solenoid but it should have come with the new starter. Most auto places should be able to test it. Any idea if you can return it?
|
Hey Captain,
Yes, the short was in the solenoid and the boat shop said they don't test starters yet they replaced it.
Installed new new starter last night and boat fires up, purrs like a kitten, turns off, doesn't blow fuses, and operates like normal.
I'll stick around the forums and try not to be a one-stop user. Thanks for all your help @mmwjr.
__________________
Toby Barnett
- 2000, Maxum 2100 SR 5.7 MerCruiser
- 1985, 15ft Zodiac Pro 60hp 2-Stroke Mercury
|
|
|
07-10-2024, 09:46 PM
|
#8
|
Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,537
|
Toby that’s great news. Yes feel free to stick around and post you knowledge as well as asking questions.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
|
|
|
07-11-2024, 07:15 PM
|
#9
|
Ensign
Join Date: Jul 2024
Location: Arlington, WA
Posts: 8
|
Get to go crabbing Saturday now and will do. Have a great weekend, Mike.
__________________
Toby Barnett
- 2000, Maxum 2100 SR 5.7 MerCruiser
- 1985, 15ft Zodiac Pro 60hp 2-Stroke Mercury
|
|
|
08-14-2024, 06:08 PM
|
#10
|
Ensign
Join Date: Jul 2024
Location: Arlington, WA
Posts: 8
|
Reporting back to the thread. Everything is a-o-k with the boat. The new start was the issue, the other parts definitely didn't hurt, and the boat starts right up with little to no effort. We've taken the boat out twice, been limited on time this year, and the wife was super happy to see it working better. Thanks for the help and I have been enjoying the forum just reading up on interiors and such.
__________________
Toby Barnett
- 2000, Maxum 2100 SR 5.7 MerCruiser
- 1985, 15ft Zodiac Pro 60hp 2-Stroke Mercury
|
|
|
08-14-2024, 08:02 PM
|
#11
|
Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,537
|
Glad it is fixed and that you and the wife are happy with how it’s performing.
__________________
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
|
|
|
![Reply](/forums/images/maxum/buttons/reply.gif) |
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Threads |
|
|
|
|
|
|
|
|
|
|
|