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  #1  
Old 01-18-2011, 10:29 PM
misterb-fx4 misterb-fx4 is offline
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Default Back-Up Light Wiring Help

I have a 98 which uses 3 bulbs in the tail lights (brake/turn/reverse). I bought some new ones that are 2 bulbs.

My plan is the use the brake and turn signal bulbs in the tail lights of course, but use the reverse lights externally.

Can I just cut off the normal connector, so I'm left with +/- wires. Then get some auxiliary lights (like these http://www.walmart.com/ip/Blazer-Rea...Light/15111237), and connect one of these axillary lights on each side?

I just need someone to confirm that the stock wiring/fuse can handle 12v 55w reverse lights. Anybody know which color wire is positive and negative? If these lights are too powerful, what should I look for?

Thanks in advance!
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  #2  
Old 01-19-2011, 09:16 PM
1KOOL1 1KOOL1 is offline
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Cool Re: Back-Up Light Wiring Help

Quote:
Originally Posted by misterb-fx4 View Post
I have a 98 which uses 3 bulbs in the tail lights (brake/turn/reverse). I bought some new ones that are 2 bulbs.

My plan is the use the brake and turn signal bulbs in the tail lights of course, but use the reverse lights externally.

Can I just cut off the normal connector, so I'm left with +/- wires. Then get some auxiliary lights (like these http://www.walmart.com/ip/Blazer-Rea...Light/15111237), and connect one of these axillary lights on each side?

I just need someone to confirm that the stock wiring/fuse can handle 12v 55w reverse lights. Anybody know which color wire is positive and negative? If these lights are too powerful, what should I look for?

Thanks in advance!
Yes, you can use the existing wires. Get a test light to find the + wire. I can't tell you what color the wires are, sorry. You might want to wire in a relay for that many amps, But is that for 1 light or 2? If that's for one light... then if you put on 2 light's, won't that be 110 amp's????HMMM?
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  #3  
Old 01-19-2011, 09:34 PM
misterb-fx4 misterb-fx4 is offline
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Default Re: Back-Up Light Wiring Help

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Originally Posted by 1KOOL1 View Post


Yes, you can use the existing wires. Get a test light to find the + wire. I can't tell you what color the wires are, sorry. You might want to wire in a relay for that many amps, But is that for 1 light or 2? If that's for one light... then if you put on 2 light's, won't that be 110 amp's????HMMM?
Thanks. I guess it's 55w for 1 light. It'll be one on each side, using the respective side's wiring.

Using P=IV, it should be 4.58A per light...
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  #4  
Old 01-19-2011, 11:18 PM
buggman buggman is offline
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Default Re: Back-Up Light Wiring Help

I'd suggest running a relay & separate power from the battery for the backup lights. You could use the + wire from the OEM wiring to trigger the relay to turn on the backup lights.

The OEM wiring may be able to handle the increased load of the lights, but I'd rather be extra safe than sorry.
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  #5  
Old 01-20-2011, 06:23 AM
rwenzing rwenzing is offline
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Default Re: Back-Up Light Wiring Help

At the taillights or transmission:
Black/pink = reverse lights positive
Black = ground

A relay is advisable for 2 55W lamps because:

-In 98, the fuse is 15A but also serves other circuits. Doubling the current to the backups might push it over the limit.

-The stock reverse light wiring is sized for 2 bulbs that pull less than half the current of a pair of 55W lamps. Copper is expensive and Ford uses what will safely support the factory parts without much reserve.

-The Transmission Range Sensor (automatic) is an expensive set of switches that include the reverse light contacts. The TRS has been known to melt when higher power aftermarket lights are used in the reverse lamp circuit. Manual transmissions use a dedicated Reverse Lamp Switch but you'd probably be pushing your luck there too by pulling double the current.
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  #6  
Old 01-20-2011, 07:42 AM
misterb-fx4 misterb-fx4 is offline
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Default Re: Back-Up Light Wiring Help

What if I just used one then? Should I use the wires from both sides to run it in parallel?
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  #7  
Old 01-20-2011, 08:45 AM
rwenzing rwenzing is offline
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Default Re: Back-Up Light Wiring Help

Quote:
Originally Posted by misterb-fx4 View Post
What if I just used one then?
That's your call but I wouldn't hesitate to use a single 55W lamp in place of the 2 stock 3156 bulbs which should be about 24~27W each. Wiring would be black/pink to the lamp positive, black to ground.
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  #8  
Old 01-20-2011, 09:01 AM
misterb-fx4 misterb-fx4 is offline
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Default Re: Back-Up Light Wiring Help

Quote:
Originally Posted by rwenzing View Post
That's your call but I wouldn't hesitate to use a single 55W lamp in place of the 2 stock 3156 bulbs which should be about 24~27W each. Wiring would be black/pink to the lamp positive, black to ground.
Thanks, can I just use the one side's wires or should I use both (parallel)?

Can I just use the original black wire for the ground?

Again, thanks for the help
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  #9  
Old 01-20-2011, 11:09 AM
rwenzing rwenzing is offline
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Default Re: Back-Up Light Wiring Help

I'd probably just use one of the black/pink wires since both factory bulbs are fed by a single 18 gauge all the way back. There should be nothing electrically wrong with using both black/pink wires in parallel though. The original black ground wire should be fine for ground.
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  #10  
Old 01-20-2011, 11:16 AM
misterb-fx4 misterb-fx4 is offline
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Default Re: Back-Up Light Wiring Help

Quote:
Originally Posted by rwenzing View Post
I'd probably just use one of the black/pink wires since both factory bulbs are fed by a single 18 gauge all the way back. There should be nothing electrically wrong with using both black/pink wires in parallel though. The original black ground wire should be fine for ground.
Awesome. Thank you so much for the help!!!!!!
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