Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE CHASSIS CLUB FORUMS > Ford Motorhome Chassis Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 04-09-2018, 08:18 AM   #1
Senior Member
 
Join Date: Mar 2011
Posts: 216
1986 E350 chassis 460 gas engine

Looking for what I may have damaged when I accidentally hooked up the chassis battery backwards. It was not hooked up to the isolator at the time, fortunately. When battery is correctly hooked up, I can jump the starter relay and get the 460 to turn over. No lights from/through the light switch; no function from the ignition switch. I'm told (and should know these things, but) the power all runs through the alternator and, if hooked up backwards, the alternator diode trio fries, rendering the normal circuits dead until a good alternator is installed. I am not an electronics tech by any stretch of the imagination. I need the simplest work through to identify the faulty parts and replace them. Thanks! BTW there was no coach battery installed, either, nor is there a generator installed.
raccoonman is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 04-09-2018, 08:35 AM   #2
Junior Member
 
Join Date: Dec 2017
Posts: 13
Check for a blown fuse link at battery side of starter relay.This is where power is fed to buss bar.
DAN33 is offline   Reply With Quote
Old 04-09-2018, 08:40 AM   #3
Senior Member
 
subford's Avatar
 
Ford Super Duty Owner
Join Date: Dec 2009
Location: Easton, Ks
Posts: 2,758
Sounds like open fuse links at the starter relay.
Check all of the fuse links by trying to streach them apart. If they streach they are bad.
After replacing the bad one see if it will crank with the key.
If it cranks and does not start you might have to replace the Ignition Control Module.
__________________
Bill
1995 COACHMEN Santara 350FL on a 1994 Ford F53
subford@gmail.com
subford is offline   Reply With Quote
Old 04-09-2018, 08:41 AM   #4
Senior Member
 
subford's Avatar
 
Ford Super Duty Owner
Join Date: Dec 2009
Location: Easton, Ks
Posts: 2,758
Quote:
Originally Posted by DAN33 View Post
This is where power is fed to buss bar.
Buss Bar???
__________________
Bill
1995 COACHMEN Santara 350FL on a 1994 Ford F53
subford@gmail.com
subford is offline   Reply With Quote
Old 04-10-2018, 07:31 AM   #5
Senior Member
 
Join Date: Mar 2011
Posts: 216
Other than some crappy connections, which I redid, there's no obvious burned fusible links. I'll have to strip the looming off all the wires coming from the starter relay out to see if anything's burned through. I did find a relay on the opposite side of the engine bay in that same circuit which could be bad. I think I'll also drop the alternator tonight and take it and have it tested tomorrow. Going to replace the positive battery cable as well, because it's just too short and difficult to mount to the battery. Not to mention just a little bit fried.
raccoonman is offline   Reply With Quote
Old 04-10-2018, 07:42 AM   #6
Senior Member
 
subford's Avatar
 
Ford Super Duty Owner
Join Date: Dec 2009
Location: Easton, Ks
Posts: 2,758
The relay on the opposite side of the engine bay is the charge relay for the coach battery.
__________________
Bill
1995 COACHMEN Santara 350FL on a 1994 Ford F53
subford@gmail.com
subford is offline   Reply With Quote
Old 04-10-2018, 10:41 AM   #7
Senior Member
 
Join Date: Mar 2011
Posts: 216
I wasn't clear enough, I knew what that one was because it's got heavy gauge cable to it and running back along the chassis. This one is up tucked under the radiator support, small black box. couldn't read any markings on it last night. Funny thing about all this is the absolute lack of a "burnt wire" odor in the cab or under the hood. Got to be something absolutely ridiculously simple in the end, just gotta find it. Bemused also by the lack of paint on the engine, not a bit of paint whatsoever. I'm used to blue and then grey, but bare metal is out of the ordinary to me. My Pace Arrow's 454 was Chevy Orange top to bottom.
raccoonman is offline   Reply With Quote
Old 04-10-2018, 02:05 PM   #8
Senior Member
 
subford's Avatar
 
Ford Super Duty Owner
Join Date: Dec 2009
Location: Easton, Ks
Posts: 2,758
You might be speaking of either the voltage regulator for the alternator or the Ignition Control Module (ICM).
Do you have any photos?
The ICM:


/
__________________
Bill
1995 COACHMEN Santara 350FL on a 1994 Ford F53
subford@gmail.com
subford is offline   Reply With Quote
Old 04-10-2018, 03:44 PM   #9
Senior Member
 
Join Date: Mar 2011
Posts: 216
Nope, found the ignition relay online. The DSII box is -visually- okay as they often have a tell-tale trail of melted potting compound if they fry. I've been told by a tech here at work to check for bad wire at the ignition switch itself. Here's to another evening checking wiring! Can't identify the alternator from online pics; going to have to pull it and have it checked.
raccoonman is offline   Reply With Quote
Old 04-11-2018, 07:27 AM   #10
Senior Member
 
Join Date: Mar 2011
Posts: 216
Ye Gods and Monsters.... Whoever designed the dual AIR pump/alternator bracket ought to be whipped. Getting the alternator out was definitely a chore. Going to swing by one or two of the chain stores and have it checked today. Job whipped my old butt so bad I didn't do much more last night. Also, that bracket was loose and rattling before I ever touched it with a wrench.... wonder if the DPO was troubled by rattling from the front of the engine? Also, the wiring to the two plugs was in good condition, so I'm feeling confident the alternator is okay, even if it's not, it's not too expensive to replace.
raccoonman is offline   Reply With Quote
Old 04-11-2018, 07:46 AM   #11
Senior Member
 
subford's Avatar
 
Ford Super Duty Owner
Join Date: Dec 2009
Location: Easton, Ks
Posts: 2,758
Not sure what you are calling an Ignition Relay as you should have no such item.

Here is a photo of the wiring at the Ignition Switch.


/
__________________
Bill
1995 COACHMEN Santara 350FL on a 1994 Ford F53
subford@gmail.com
subford is offline   Reply With Quote
Old 04-11-2018, 10:35 AM   #12
Senior Member
 
Join Date: Mar 2011
Posts: 216
That's my next target; it's not terribly difficult to reach. Any scorched wires there should be obvious. Amazingly the alternator is marked for only 60amps. I would have thought they'd have gone for 78 to 100.
raccoonman is offline   Reply With Quote
Old 04-13-2018, 07:13 AM   #13
Senior Member
 
Join Date: Mar 2011
Posts: 216
Nothing burned at the ignition switch; removed all the loom wrap from the wiring harness from the starter relay to the driver's side firewall, found nothing obvious. jumped four fusible link wires that are topside, nothing. Haven't checked the wire that should piggyback to the starter. Haven't pulled the headlight switch, either. Jumped the ignition wire to positive and jumped the relay, engine turned over but would not start. No action on the instrument panel when ignition terminal jumped, where the gauges should have reacted. Returned everything to stage one except fusible links. It's going to be just one thing causing all of this confusion; that's always been my experience. Still amazed that the alternator is only rated at 60A..... then again, my Falcons all used 35A alternators or generators
raccoonman is offline   Reply With Quote
Old 04-13-2018, 07:34 AM   #14
Senior Member
 
subford's Avatar
 
Ford Super Duty Owner
Join Date: Dec 2009
Location: Easton, Ks
Posts: 2,758
Maybe these wiring diagrams may help.




/
__________________
Bill
1995 COACHMEN Santara 350FL on a 1994 Ford F53
subford@gmail.com
subford is offline   Reply With Quote
Reply

Tags
chassis, engine, gas



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
1986 Coachmen E350 stupid mistake raccoonman Class C Motorhome Discussions 4 03-29-2018 12:23 PM
Replacing spark plugs 460 Ford powered 1989 E350 chassis Geocritter Class C Motorhome Discussions 6 01-02-2018 11:29 PM
New 1986 Ford E350 Mallard owners martinakamsd New Member Check-In 6 01-11-2017 03:08 PM
1986 ford e350 7.5l 460 mechanical fuel pump location Redneckrv MH-General Discussions & Problems 1 06-23-2016 02:40 PM
alternator wiring in 1986 E350 boomvan Ford Motorhome Chassis Forum 5 04-02-2012 08:13 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 01:43 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.