Printer Friendly Forum Posts - 2008 dodge ram remote start resistors

gonna attempt an 2008 Dodge Ram Pro Start remote start planning on using a Fortin Bypass , looking at my schematics autostater,org gave me it says i have to wire in a resistor on the starter wire and another resistor on the acessory wire , i have done quiet a few remote starts mostly on Fords but not one of them have called for a resistor , not sure if these schemeatics are correct never really had to wire in resistors before can anyone tell me more about this and if so how do u go about installing these resistors

Check this link for the basics and depending on the module You use will determine if you need to do the resistors. https://www.the12volt.com/installbay/forum_posts.asp~TID~114758#556188

thanks man well i did go over that linked page u gave me just weird cuz the schemeatics i got from Prostart are indicating i need resistors on my starter and acessorie wire how ever tho i notice the acessorie wire on your link is different compared to the acessorie wire they give me? mabey ill just use your guys link and wire it up and see if the engine fires

How are they different? You have to understand how the MUX works, by grounding through the resistor(s). Its verifying a key turn of the cylinder through resistence. BCM reads the MUX wire resistence if it sees the stored set resistence for ACC it allows the action to occur with out triggering the security. If it see's the 180 ohms it enables the start. Basicly 1 wire multi function just like the Mopar door locks do. So the resistence on the MUX wire is controlled by the ignition switch position. So it sounds like they are telling you to add the resistors to act as the switch by getting the power from the ign. 1 and start 1 wires to the MUX wire. Which would work but it's equal to disabling the security of that function. Which means hot wiring the vehicle would be that much easier. Relay's are the best if you don't want to buy a module to do it for you. So the remote start has to enable the relays to send to the MUX Wire.

Or a slight variation on resistive locks, 1 wire MUX and the lock processor needs to see 8 volts, the unlock side 5 volts.

-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

The ignition MUX is resitence not voltage as it uses ground not voltage in circuit. Otherwise you would be draining voltage to groung all the while the ACC is on. Door locks are a pulse not constant like the Ign.

If you are using a Fortin module you won't need any of this. The module will create the resisted values for you for start, accessory and locks. All you will need resistors for is parking lights if you use negative.

-------------
Mike M2
Tech Manager
CS Dealer Services

Lurch, sorry but you missed my point.
It doesn't matter whether in the individual circumstances it's a (+) or a (-) the resistor gives that line a voltage differential to recognise.

-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

never used a fortin bypass myself but most bypass modules these days for dodge will 100% operate the ignition you just have to give the bypass module the appropriate signals from whatever remote starter you have using a wired or data connection to the remote starter. i know that the brand i use most they also sell a plug and play harness for dodge that does the install for you leaving only the optional extras for you to do. you might need to try a firmware update on the bypass to get more up to date instructions on your car.

-------------

Yes FORTIN does have a. Data to data. Connection that goes from the bypass module an plugs rit into the Remote start module

ok, if you use D2D mode then you should only have a few basic connections to make at the ignition harness unless your bypass is compatible with the plug and play harness for that specific truck. either way it should be easy enough. if by some chance you still end up needing to add resistors then you will probably only have to add them straight to the wires from the bypass instead of having to use relays.

if your bypass happens to only be a transponder bypass then you will have to do it the old school way with nothing but relays and resistors being fed directly from the outputs of the remote starter, which can be a decent amount of headache especially if you arent good with relays.

-------------

Ya I suck at wiring in resistors an relays. Not a lot of experience with them. Since I been doing remote starters I've been pretty spoil ed lol too bad tho. The relay an resistor experience would be nice.

its really not that hard if you have to do it. all you are doing is changing a positive output from the remote starter to a negative output and adding a resister to the ground source you are passing through each relay. i wish i had a diagram for you to see

-------------

Here is a diagram from Audiovox for a start and accessory relay setup ( 2006 Ram 1500 ) : https://documents.audiovox.com/701131.pdf

-------------
Soldering is fun!

hey thanks KREG this is exactly what i needed i should be good now do u kno what size of Relay i need?

one more thing i notice one of the relays says satus output (-) from remote start would this be my while running wire from my prostart??

Actually anything from a 5 amp PCB type to a Bosch/Tycho standard auto relay, 4 pin 85 86 87 and 30.
You could also get a 5 pin where 87a isn't used.

-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

It's a low current application, so a 10 Amp relay should be fine. You can use the standard Bosch style 30/40 Amp relays, too.

Your resistor values might be different, the diagram was for other vehicles.

However, if you are using a Fortin EVO-( ALL, CAN, CHR ) bypass, no relays and resistors are needed. Are you using a Fortin bypass module? If yes, which one?

-------------
Soldering is fun!

Yes. Status output = GWR wire.

-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Yes on the Ground When Running, (-) Status Output, (-) Third Ignition, (-) While Running wire. Each manufacturer has their own name for this signal.

-------------
Soldering is fun!

Hi, Howard! posted_image

-------------
Soldering is fun!

i wish i have joined this forum before thanks alot guys i think i have more than enough info to complete the install posted_image

However, if you are using a Fortin EVO-( ALL, CAN, CHR ) bypass, no relays and resistors are needed. Are you using a Fortin bypass module? If yes, which one?

-------------
Soldering is fun!

gberland, just PMed you. Like Kreg states, buy a Fortin EVO ALL and follow the instructions on tech sheet 5051. If you want to make it real simple, buy the THAR CHR5 harness too(it's an alternative to hard wiring the ignition harness) . It's not a must have for this install but if the harness is cheap enough it will save you some time...

-------------
Mike M2
Tech Manager
CS Dealer Services

well got my bypass today its a EVO CAN i believe i noticed also besides the usual harness it comes with it came with another harness that plugs right into the ignition pretty sure its a THAR - CHR 2

so then all i have to do is just wire in the remote start to the according wires and plug in the bypass and this should work hey ?? no resistors involved ? im sorry guys this is my FIRST Dodge remote start ive done tons of FORDS a few chevys but not a DODGE thanks

EVO-CAN? Are you sure? The THAR-CHR2 harness is usually used with the EVO-CHR bypass module. The EVO-ALL
needs the THAR-CHR5 harness for your truck.

Looks like the EVO-CAN does not use any THAR harness for install with the 2008 Dodge RAM. Here is a link to
the listed Install Guide for your application that does the transponder bypass function, etc :
https://ifar.ca/download/5311/evo-can_chrysler_dodge_jeep_%28skreem%29.rev-20120717.pdf
( Note that EVO-CAN Install Guide #3323 does not indicate support for the transponder bypass function.)

Whether you will be able to go D2D depends on which remote starter you will be using. Went back thru this post
and could not find one listed, so here is a link to Fortin that lists all DataLink compatable brands and their
level ( 1 way or 2 way ) of support : https://ifar.ca/en/datalink/ If your chosen brand is not listed as DataLink
compatible, then you must manually hardwire all of the install diagrams dashed lines. It does show one 470 ohm
resistor and a fuse holder with 5 amp fuse as required to effect this install.

I would reccomend a call to Fortin Tech Support for confirmation.

-------------
Soldering is fun!

Yes my bypass had Data to data i already mentioned that it plugs right into my PROSTART Module , Ok so the bypass I have is EVO - CHR-T2 thats what the box says

sorry i didnt read the box right last nit

Which ProStart system? CT-3371? ProStart is not one of the brands I am familiar with. While the Fortin
Datalink compatibility page does not list any ProStart units, the CT-3371 Install Guide does show a D2D
port for iDatalink and Fortin bypass modules. In the CT-3371 install guide there is a programming option
to set for the Fortin bypass module, Menu 3, Function 2, Option 3. The is another programming option for
bypass type, Menu 3, Function 3, Option 1. This also indicates that only 1 way D2D comm is supported.

Here is a link to the Fortin EVO-CHR install guide : https://ifar.ca/download/5931/preview.html
You would follow the Connection C diagram on Page 6 for the EVO-CHR T2 (THAR-CHR2) with Data-Link. If your
ProStart unit can only handle one way comm, all of the dashed lines wire connections would have to be made
between the ProStart and the Fortin EVO-CHR.

-------------
Soldering is fun!

Hey KREG were do u find the fortin compatiblilty page on which remote start modules are compatible cuz now that u mention it i looked at my CT 500 module and i dont see a D2D connection DAMMIT!!! lol i mostly do CT 3371 this is my first CT500

Here is the Fortin Data-Link compatibility page : https://ifar.ca/en/datalink/

-------------
Soldering is fun!

kreg357 wrote:

EVO-CAN? Are you sure? The THAR-CHR2 harness is usually used with the EVO-CHR bypass module. The EVO-ALL
needs the THAR-CHR5 harness for your truck.

Looks like the EVO-CAN does not use any THAR harness for install with the 2008 Dodge RAM. Here is a link to
the listed Install Guide for your application that does the transponder bypass function, etc :
https://ifar.ca/download/5311/evo-can_chrysler_dodge_jeep_%28skreem%29.rev-20120717.pdf
( Note that EVO-CAN Install Guide #3323 does not indicate support for the transponder bypass function.)

Whether you will be able to go D2D depends on which remote starter you will be using. Went back thru this post
and could not find one listed, so here is a link to Fortin that lists all DataLink compatable brands and their
level ( 1 way or 2 way ) of support : https://ifar.ca/en/datalink/ If your chosen brand is not listed as DataLink
compatible, then you must manually hardwire all of the install diagrams dashed lines. It does show one 470 ohm
resistor and a fuse holder with 5 amp fuse as required to effect this install.

I would reccomend a call to Fortin Tech Support for confirmation.

According to Fortin, the CHR2 harness is now compatable with the EVO ALL...

-------------
Mike M2
Tech Manager
CS Dealer Services

ya looks like i have no DATA to DATA posted_image

so basically its not that bad tho i just have to do some hard wiring from the bypass to the remote start module, i was wondering tho do i still have to wire in the wires from the remote start to the vehicle?? or just the wires that go from the bypass to the remote start module

Follow the EVO-CHR Connection D install diagram on Page 7. It shows the necessary connections. If there is
a Horn output from your ProStart unit, you can connect that. Also, if the truck does not have a Factory Hood
pin, the EVO-CHR will not be able to supply that signal and you must install the hood pin in the ProStart kit.

-------------
Soldering is fun!