need some help here folks
#1
need some help here folks
some of you know mitchert did the boat and dash . well unfourtunately got some dash probs when he re wired it ,anyhelp would be great , starboard engine alerts go off as soon as i turn the key , also when the panal lights turned are turned on . under both instances the oil pressure pegs the needle . when i turn the key on everything seems to do the oppsite what it should .volt meter pegs the bottom of the gauge , goes backwords . oil pressure pegs the needle at 80 . tack goes upwards unlike normally comming down to 0 when keys turned on . ground maybe ?? he did such a great job though thanks rob
#2
Platinum Member
Platinum Member
Hey, you might want to "not" mention who did the job if there's a simple oversight on an otherwise great job. It's kind of rude.
Yes, you probably have a simple cross connection between a sending unit and a ground terminal. Most senders are variable ground resistors. If you have clear view of the rear of the gauges, just get in there with lots of light and slowly trace the "hopscotch" of the ground wire from the terminal block across all of the gauges, making sure it is attached to the proper terminal on each and every gauge.
Then do the same with the power, and the illlumination wires. If those three wires are all on the proper terminals, you should only have problems with gauges where the sending units are messed up, but it should be isolated to those gauges only, and not a system wide weird situaiton.
MC
Yes, you probably have a simple cross connection between a sending unit and a ground terminal. Most senders are variable ground resistors. If you have clear view of the rear of the gauges, just get in there with lots of light and slowly trace the "hopscotch" of the ground wire from the terminal block across all of the gauges, making sure it is attached to the proper terminal on each and every gauge.
Then do the same with the power, and the illlumination wires. If those three wires are all on the proper terminals, you should only have problems with gauges where the sending units are messed up, but it should be isolated to those gauges only, and not a system wide weird situaiton.
MC
#4
Hey, you might want to "not" mention who did the job if there's a simple oversight on an otherwise great job. It's kind of rude.
Yes, you probably have a simple cross connection between a sending unit and a ground terminal. Most senders are variable ground resistors. If you have clear view of the rear of the gauges, just get in there with lots of light and slowly trace the "hopscotch" of the ground wire from the terminal block across all of the gauges, making sure it is attached to the proper terminal on each and every gauge.
Then do the same with the power, and the illlumination wires. If those three wires are all on the proper terminals, you should only have problems with gauges where the sending units are messed up, but it should be isolated to those gauges only, and not a system wide weird situaiton.
MC
Yes, you probably have a simple cross connection between a sending unit and a ground terminal. Most senders are variable ground resistors. If you have clear view of the rear of the gauges, just get in there with lots of light and slowly trace the "hopscotch" of the ground wire from the terminal block across all of the gauges, making sure it is attached to the proper terminal on each and every gauge.
Then do the same with the power, and the illlumination wires. If those three wires are all on the proper terminals, you should only have problems with gauges where the sending units are messed up, but it should be isolated to those gauges only, and not a system wide weird situaiton.
MC
#5
Rob try powering everything up then start pulling and replacing individual fuses one at a time, if you catch one that drops the condition you are on the right track. Have someone at the main power in case anything gets hot and you need a quick power off. As said sounds like a crossed ground or a ground that is not connected causing it to back feed. Approach it systematically and you'll find it in no time. I hate to say it but i have always kinda liked these probs in a weird sort of way, kinda like a puzzle lol.
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Throttles- Cleveland Construction 377 Talon
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10 OPA Class 1 National Champion ( happy now Ed! )
Throttles- Cleveland Construction 377 Talon
08 OPA Class 1 National Champion
08 Class 1 Geico Triple Crown Champion
08 OPA High Points Champion
10 OPA Class 1 National Champion ( happy now Ed! )
#7
I was going to say, this sounds like a bad ground. Had similar symptoms with mine.
#8
Registered
iTrader: (3)
Rob, follow the wires from behind the dash, the port side should have a plug, and so should the starboard, that goes into the side of the hull under the dash. Those plugs go back to the engines.
Each plug will have a black wire, which is ground. One of them may have a heavier gauge black wire than the other. You need to make sure that those black wires, that run back to the engines, are grounded coming out of the engine side of the harness. If it is not grounded at the engines, the dash will try to find a ground thru the light circuit.
If your trim pumps, nav lights, and cabin power are working ok, my guess is your gauges are not grounded to the engine like they should be.
I believe the main power wire that powers the cabin, trim switches, blower, horn, etc, all come from the engine harness, so if there is a short, it will pop the engine breaker. But, the ground for those goes directly to the batteries, i believe, its been a while. So like i said, if that stuff is working fine, and its just the gauges, make sure those gauges are getting a good ground at the engines, and the engines are getting a good ground to the batteries.
Each plug will have a black wire, which is ground. One of them may have a heavier gauge black wire than the other. You need to make sure that those black wires, that run back to the engines, are grounded coming out of the engine side of the harness. If it is not grounded at the engines, the dash will try to find a ground thru the light circuit.
If your trim pumps, nav lights, and cabin power are working ok, my guess is your gauges are not grounded to the engine like they should be.
I believe the main power wire that powers the cabin, trim switches, blower, horn, etc, all come from the engine harness, so if there is a short, it will pop the engine breaker. But, the ground for those goes directly to the batteries, i believe, its been a while. So like i said, if that stuff is working fine, and its just the gauges, make sure those gauges are getting a good ground at the engines, and the engines are getting a good ground to the batteries.
#9
Registered
iTrader: (3)
Oh, and rob, if you have access to some jumper cables, try this....
hook the black side of the cable to the neg post of the battery. DO NOT hook up the pos side. Then run the cable up near the dash area. Get yourself a jumper wire with a alligator clip. Attach it to the ground on one of the gauges that easily accessible, then attach it to the ground of the jumper cable, and see what you get.
If this helps
Blue wire=oil psi sender
Tan=water temp sender
Purple=IGN hot feed
Brown with white stripe =oil temp sender
Pink=Fuel sender
Yellow with red stripe=starter solenoid
black=ground
gray=tach signal
hook the black side of the cable to the neg post of the battery. DO NOT hook up the pos side. Then run the cable up near the dash area. Get yourself a jumper wire with a alligator clip. Attach it to the ground on one of the gauges that easily accessible, then attach it to the ground of the jumper cable, and see what you get.
If this helps
Blue wire=oil psi sender
Tan=water temp sender
Purple=IGN hot feed
Brown with white stripe =oil temp sender
Pink=Fuel sender
Yellow with red stripe=starter solenoid
black=ground
gray=tach signal
Last edited by MILD THUNDER; 04-06-2012 at 08:56 AM.
#10
Charter Member #1171
Charter Member
hook the black side of the cable to the neg post of the battery. DO NOT hook up the pos side. Then run the cable up near the dash area. Get yourself a jumper wire with a alligator clip. Attach it to the ground on one of the gauges that easily accessible, then attach it to the ground of the jumper cable, and see what you get.
And Rob is in Wisconsin,,,,Mitch in in Michigan,,,, I can see him not wanting to bring it back
How far into Wisconsin are you?
Mitch is one of my best friends, if we cant do this over the forum or on the phone and if you can get to Chicago to my shop I will take care of it no charge.
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I want to live in a world where a chicken can cross the road and not have its motives questioned.
I want to live in a world where a chicken can cross the road and not have its motives questioned.